Merge branch 'jk/diff-files-cleanup-fix' into maint

An earlier attempt to plug leaks placed a clean-up label to jump to
at a bogus place, which as been corrected.
source: <Ys0c0ePxPOqZ/5ck@coredump.intra.peff.net>

* jk/diff-files-cleanup-fix:
  diff-files: move misplaced cleanup label

builtin/diff-files.c

@@ -80,9 +80,9 @@ int cmd_diff_files(int argc, const char **argv, const char *prefix)
 		result = -1;
 		goto cleanup;
 	}
-cleanup:
 	result = run_diff_files(&rev, options);
 	result = diff_result_code(&rev.diffopt, result);
+cleanup:
 	release_revisions(&rev);
 	return result;
 }