fix bug

Author: wayuanho

tf2onnx/tfonnx.py

@@ -2299,21 +2299,21 @@ def rewrite_conv2d_with_pad(g, ops):
         paddings = pad.inputs[1]
 
         if not paddings.is_const():
-            return ops
+            continue
         mode = pad.get_attr("mode")
         if mode:
             mode = mode.s.decode("utf-8").lower()
         if mode not in [None, "constant"] or len(pad.input) >= 3:
-            return ops
+            continue
         # Conv2D already has a pad
         if conv.get_attr("padding") == "SAME":
-            return ops
+            continue
 
         log.debug("merge pad [%s] into conv [%s]", pad.name, conv.name)
         paddings_val = np.array(paddings.get_tensor_value())
         # can't pad on batch or channel dimensions
         if np.any(paddings_val[0]) or np.any(paddings_val[3]):
-            return ops
+            continue
         paddings_val = paddings_val[1:3]
         paddings_val = paddings_val.transpose().flatten()
         g.replace_input(conv, conv.input[0], pad.input[0])