Add return when input is tensor (#33570)

* add return when input is tensor

* fix typo

python/paddle/tensor/creation.py

@@ -134,8 +134,9 @@ def to_tensor(data, dtype=None, place=None, stop_gradient=True):
                 )
         elif isinstance(data, paddle.Tensor):
             data = data._copy_to(place, False)
-            ata = _handle_dtype(data, dtype)
+            data = _handle_dtype(data, dtype)
             data.stop_gradient = stop_gradient
+            return data
         elif isinstance(data, (core.LoDTensor, core.Tensor)):
             # Note(zhouwei25): should't expose it to users, just for internal use.
             # convert core.Tensor/core.LoDTensor to VarBase first
@@ -145,6 +146,7 @@ def to_tensor(data, dtype=None, place=None, stop_gradient=True):
                 data = data._copy_to(place, False)
             data = _handle_dtype(data, dtype)
             data.stop_gradient = stop_gradient
+            return data
         else:
             raise TypeError(
                 "Can't constructs a 'paddle.Tensor' with data type {}, data type must be scalar|list|tuple|numpy.ndarray|paddle.Tensor".