firmware: imx: scu: Use devm_mutex_init

In normal case, there is no need to invoke mutex_destroy in error path,
but it is useful when CONFIG_DEBUG_MUTEXES, so use devm_mutex_init().

Reviewed-by: Frank Li <[e-mail]>
Signed-off-by: Peng Fan <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

drivers/firmware/imx/imx-scu.c

···
 	}
 
 	sc_ipc->dev = dev;
-	mutex_init(&sc_ipc->lock);
+	ret = devm_mutex_init(dev, &sc_ipc->lock);
+	if (ret)
+		return ret;
 	init_completion(&sc_ipc->done);
 
 	imx_sc_ipc_handle = sc_ipc;