check_compliance: fix broken format() in exception handler

Likely an accident when commit 288ae28c13 moved the script to the main
repo. Stayed unnoticed because this handler rarely ever runs.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

scripts/ci/check_compliance.py

@@ -1086,7 +1086,8 @@ def main():
     except BaseException:
         # Catch BaseException instead of Exception to include stuff like
         # SystemExit (raised by sys.exit())
-        print(format(__file__, traceback.format_exc()))
+        print("Python exception in `{}`:\n\n"
+              "```\n{}\n```".format(__file__, traceback.format_exc()))
 
         raise