[MLIR] Fix memory leak in importWebAssemblyToModule when it fails to import (#153794)

Author: joker-eph

mlir/lib/Target/Wasm/TranslateFromWasm.cpp

@@ -1052,6 +1052,8 @@ class WasmBinaryParser {
   ModuleOp getModule() {
     if (isValid)
       return mOp;
+    if (mOp)
+      mOp.erase();
     return ModuleOp{};
   }