wireless, mwifiex: drop redundant NULL test before call to release_firmware()

Since release_firmware() does its own test for NULL it is redundant to
do so before calling it.
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/main.c

@@ -342,8 +342,7 @@ static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 	ret = 0;
 
 done:
-	if (adapter->firmware)
-		release_firmware(adapter->firmware);
+	release_firmware(adapter->firmware);
 	if (ret)
 		ret = -1;
 	return ret;