Fixed hexdiff bug introduced by previous patch.

src/binwalk/core/module.py

@@ -328,7 +328,7 @@ class Module(object):
 
         return args
 
-    def next_file(self):
+    def next_file(self, close_previous=True):
         '''
         Gets the next file to be scanned (including pending extracted files, if applicable).
         Also re/initializes self.status.
@@ -337,6 +337,7 @@ class Module(object):
         fp = None
 
         # Ensure files are close to prevent IOError (too many open files)
+        if close_previous:
             try:
                 self.previous_next_file_fp.close()
             except KeyboardInterrupt as e:

src/binwalk/modules/hexdiff.py

@@ -185,7 +185,13 @@ class HexDiff(Module):
             self.block = self.DEFAULT_BLOCK_SIZE
 
         # Build a list of files to hexdiff
-        self.hex_target_files = [x for x in iter(self.next_file, None)]
+        self.hex_target_files = []
+        while True:
+            f = self.next_file(close_previous=False)
+            if not f:
+                break
+            else:
+                self.hex_target_files.append(f)
 
         # Build the header format string
         header_width = (self.block * 4) + 2