fix(mgb/opr): fix bazel compile error by comma in mgb_throw_if's format string

GitOrigin-RevId: 72d19aecd1f470ecc51acbb9df09b24535cc4ce8

src/opr/impl/dnn/batch_norm.cpp

@@ -50,8 +50,8 @@ BatchNormForward::BatchNormForward(VarNode *x,
             mgb_throw_if(!(dest_opr->same_type<SharedDeviceTensor>() ||
                     dest_opr->same_type<VolatileSharedDeviceTensor>()),
                     GraphError,
-                    "mean and variance in training mode BatchNorm must be",
-                    "SharedDeviceTensor or VolatileSharedDeviceTensor;",
+                    "mean and variance in training mode BatchNorm must be"
+                    "SharedDeviceTensor or VolatileSharedDeviceTensor;"
                     "got %s{%s} actually",
                     dest_opr->cname(), dest_opr->dyn_typeinfo()->name);
         };