[Quality] Remove redundant return (#2925)

Author: b10902118

torchrl/data/replay_buffers/samplers.py

@@ -526,8 +526,6 @@ def sample(self, storage: Storage, batch_size: int) -> torch.Tensor:
             index = unravel_index(index, storage.shape)
         return index, {"_weight": weight}
 
-        return index, {"_weight": weight}
-
     def add(self, index: torch.Tensor | int) -> None:
         super().add(index)
         self._maybe_erase_max_priority(index)