Pacify check_files

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/scripts/check_files.py b/tests/scripts/check_files.py
index a2a9dfa..837905e 100755
--- a/tests/scripts/check_files.py
+++ b/tests/scripts/check_files.py
@@ -172,6 +172,8 @@
         b'sh': 'sh',
     }
 
+    path_exemptions = re.compile(r'tests/scripts/quiet/.*')
+
     def is_valid_shebang(self, first_line, filepath):
         m = re.match(self._shebang_re, first_line)
         if not m: