fix use before assignment case

Summary: If retries is 0, then `0 < 0` is false, meaning we will skip the `while` loop completely and just try to read retcode, which was never assigned.

Reviewed By: fanzeyi

Differential Revision: D23999523

fbshipit-source-id: fac4a1104eba3585fb52fc8d83163cb1a87b8fee

build/fbcode_builder/getdeps/builder.py

@@ -709,7 +709,7 @@ if __name__ == "__main__":
                 args += ["-R", test_filter]
 
             count = 0
-            while count < retry:
+            while count <= retry:
                 retcode = self._run_cmd(
                     args, env=env, use_cmd_prefix=use_cmd_prefix, allow_fail=True
                 )