tests: check_selftest: ignore files outside of net

tools/testing/selftests/Makefile is not formatted according
to our preference but we try to test it. Ignore files which
don't have /net in their path.

Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

tests/patch/check_selftest/test.py

@@ -143,6 +143,8 @@ def extract_files(patch):
             continue
         if 'tools/testing/selftests/' not in next_line:
             continue
+        if '/net/' not in next_line:
+            continue
 
         file_path = next_line[6:]