Fix FuseMMWithAdd returning False after graph mutation

Differential Revision: D103935830

Pull Request resolved: #19318

Author: abeakkas

backends/cadence/aot/fuse_ops.py

@@ -190,7 +190,7 @@ def maybe_remove_or_replace(self, node: torch.fx.Node) -> bool:
         #    is True)
         # 2. The single successor of addmm is not a view op.
         if len(addmm_node.users) == 0:
-            return False
+            return True
 
         addmm_user = list(addmm_node.users.keys())[0]
         if intermediate_view and not self._is_view_node(addmm_user):