ipmi: Replace guid_copy() with import_guid() where it makes sense

There is a specific API to treat raw data as GUID, i.e. import_guid().
Use it instead of guid_copy() with explicit casting.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Message-Id: <20200422130348.38749-1-andriy.shevchenko@linux.intel.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -3172,7 +3172,7 @@ static void guid_handler(struct ipmi_smi *intf, struct ipmi_recv_msg *msg)
 		goto out;
 	}
 
-	guid_copy(&bmc->fetch_guid, (guid_t *)(msg->msg.data + 1));
+	import_guid(&bmc->fetch_guid, msg->msg.data + 1);
 	/*
 	 * Make sure the guid data is available before setting
 	 * dyn_guid_set.