run_checks: Add main block

scripts/run_checks.py

@@ -221,6 +221,7 @@ def _get_args(checker):
     return args
 
 
+def main():
     argv = sys.argv[:]
     check_unittest()
     check_git()
@@ -242,6 +243,10 @@ for (k, v) in status.items():
         print('  {} - {}'.format(k, v))
 
     if all(val in (True, 0) for val in status):
-    sys.exit(0)
+        return 0
     else:
-    sys.exit(1)
+        return 1
+
+
+if __name__ == '__main__':
+    sys.exit(main())