Revert "search buffers for dtype" (#23308)

Revert "search buffers for dtype (#23159)"

This reverts commit ef42c2c4.

src/transformers/modeling_utils.py

@@ -207,15 +207,7 @@ def get_parameter_dtype(parameter: Union[nn.Module, GenerationMixin, "ModuleUtil
         # if no floating dtype was found return whatever the first dtype is
         return last_dtype
 
-    for t in parameter.buffers():
-        last_dtype = t.dtype
-        if t.is_floating_point():
-            return t.dtype
-
-    if last_dtype is not None:
-        # if no floating dtype was found return whatever the first dtype is
-        return last_dtype
-
+    else:
         # For nn.DataParallel compatibility in PyTorch > 1.5
         def find_tensor_attributes(module: nn.Module) -> List[Tuple[str, Tensor]]:
             tuples = [(k, v) for k, v in module.__dict__.items() if torch.is_tensor(v)]