Remove duplicated os.path.join (#17192)

src/transformers/trainer.py

@@ -1808,7 +1808,7 @@ class Trainer:
         local_rank = xm.get_local_ordinal() if is_torch_tpu_available() else self.args.local_rank
         if local_rank != -1:
             rng_file = os.path.join(checkpoint, f"rng_state_{local_rank}.pth")
-            if not os.path.isfile(os.path.join(checkpoint, rng_file)):
+            if not os.path.isfile(rng_file):
                 logger.info(
                     f"Didn't find an RNG file for process {local_rank}, if you are resuming a training that "
                     "wasn't launched in a distributed fashion, reproducibility is not guaranteed."