Improve the comment for the 'slab_common.usercopy_fallback' check

kernel_hardening_checker/checks.py

@@ -505,8 +505,9 @@ def add_cmdline_checks(l, arch):
                  CmdlineCheck('self_protection', 'kspp', 'hardened_usercopy', 'is not set')))]
     l += [AND(CmdlineCheck('self_protection', 'kspp', 'slab_common.usercopy_fallback', 'is not set'),
               KconfigCheck('self_protection', 'kspp', 'HARDENED_USERCOPY_FALLBACK', 'is not set'))]
-              # don't require slab_common.usercopy_fallback=0,
-              # since HARDENED_USERCOPY_FALLBACK was removed in Linux v5.16
+              # Consequence of the HARDENED_USERCOPY_FALLBACK check by kspp.
+              # Don't require slab_common.usercopy_fallback=0,
+              # since HARDENED_USERCOPY_FALLBACK was removed in Linux v5.16.
     if arch in ('X86_64', 'ARM64', 'X86_32'):
         l += [OR(CmdlineCheck('self_protection', 'kspp', 'iommu.strict', '1'),
                  AND(KconfigCheck('self_protection', 'kspp', 'IOMMU_DEFAULT_DMA_STRICT', 'y'),