Fix the bug in the functional tests

`man 1 sh` says about '-e':
```
The shell does not exit if the command that fails is part of the command list
immediately following a while or until keyword, part of the test following
the if or elif reserved words, part of any command executed in a && or || list
except the command following the final && or ||, any command in a pipeline
but the last, or if the command's return value is being inverted with !.

That's why testing error handling in the functional tests didn't check
the exit status at all :(

Let's fix that.
Example before the fix:
! coverage run -a --branch bin/kconfig-hardened-check -l /proc/cmdline
Example after the fix:
coverage run -a --branch bin/kconfig-hardened-check -l /proc/cmdline && exit 1

.github/workflows/functional_test.sh

@@ -59,62 +59,62 @@ echo "\n>>>>> have checked $COUNT kconfigs <<<<<"
 
 echo "Collect coverage for error handling"
 echo ">>>>> lonely -l <<<<<"
-! coverage run -a --branch bin/kconfig-hardened-check -l /proc/cmdline
+coverage run -a --branch bin/kconfig-hardened-check -l /proc/cmdline && exit 1
 
 echo ">>>>> wrong modes for -p <<<<<"
-! coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -m show_ok
-! coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -m show_fail
+coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -m show_ok && exit 1
+coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -m show_fail && exit 1
 
 echo ">>>>> -p and -c together <<<<<"
-! coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -c kconfig_hardened_check/config_files/distros/fedora_34.config
+coverage run -a --branch bin/kconfig-hardened-check -p X86_64 -c kconfig_hardened_check/config_files/distros/fedora_34.config && exit 1
 
 echo ">>>>> wrong mode for -g <<<<<"
-! coverage run -a --branch bin/kconfig-hardened-check -g X86_64 -m show_ok
+coverage run -a --branch bin/kconfig-hardened-check -g X86_64 -m show_ok && exit 1
 
 echo ">>>>> -g and -c together <<<<<"
-! coverage run -a --branch bin/kconfig-hardened-check -g X86_64 -c kconfig_hardened_check/config_files/distros/fedora_34.config
+coverage run -a --branch bin/kconfig-hardened-check -g X86_64 -c kconfig_hardened_check/config_files/distros/fedora_34.config && exit 1
 
 cp kconfig_hardened_check/config_files/distros/fedora_34.config ./test.config
 
 echo ">>>>> no kernel version <<<<<"
 sed '3d' test.config > error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> strange kernel version string <<<<<"
 sed '3 s/5./version 5./' test.config > error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> no arch <<<<<"
 sed '305d' test.config > error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> more than one arch <<<<<"
 cp test.config error.config
 echo 'CONFIG_ARM64=y' >> error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> invalid disabled kconfig option <<<<<"
 sed '28 s/is not set/is not set yet/' test.config > error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> invalid enabled kconfig option <<<<<"
 cp test.config error.config
 echo 'CONFIG_FOO=is not set' >> error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> one config option multiple times <<<<<"
 cp test.config error.config
 echo 'CONFIG_BUG=y' >> error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> invalid compiler versions <<<<<"
 cp test.config error.config
 sed '8 s/CONFIG_CLANG_VERSION=0/CONFIG_CLANG_VERSION=120000/' test.config > error.config
-! coverage run -a --branch bin/kconfig-hardened-check -c error.config
+coverage run -a --branch bin/kconfig-hardened-check -c error.config && exit 1
 
 echo ">>>>> multi-line cmdline file <<<<<"
 echo 'hey man 1' > cmdline
 echo 'hey man 2' >> cmdline
-! coverage run -a --branch bin/kconfig-hardened-check -c test.config -l cmdline
+coverage run -a --branch bin/kconfig-hardened-check -c test.config -l cmdline && exit 1
 
 echo "The end of the functional tests"