Fix filtering of where edits are applied when --all switch is used.

tools/clang/scripts/run_tool.py

Index: tools/clang/scripts/run_tool.py
diff --git a/tools/clang/scripts/run_tool.py b/tools/clang/scripts/run_tool.py
index 205d281556c6b396157d7e2cb799e6ca6cb320fd..42b085eb1a6f63e84ce778c7d3f80b1d09c273ea 100755
--- a/tools/clang/scripts/run_tool.py
+++ b/tools/clang/scripts/run_tool.py
@@ -319,11 +319,10 @@ def main():
   if args.generate_compdb:
     compile_db.GenerateWithNinja(args.compile_database)
 
+  filenames = set(_GetFilesFromGit(args.path_filter))
   if args.all:
-    filenames = set(_GetFilesFromCompileDB(args.compile_database))
-    source_filenames = filenames
+    source_filenames = set(_GetFilesFromCompileDB(args.compile_database))
   else:
-    filenames = set(_GetFilesFromGit(args.path_filter))
     # Filter out files that aren't C/C++/Obj-C/Obj-C++.
     extensions = frozenset(('.c', '.cc', '.cpp', '.m', '.mm'))
     source_filenames = [f
@@ -343,4 +342,4 @@ def main():
 
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(main())