libertas: remove redundant assignment to variable ret

The variable ret is being initialized with a value that is never
read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/libertas/main.c

@@ -1046,7 +1046,7 @@ int lbs_rtap_supported(struct lbs_private *priv)
 int lbs_start_card(struct lbs_private *priv)
 {
 	struct net_device *dev = priv->dev;
-	int ret = -1;
+	int ret;
 
 	/* poke the firmware */
 	ret = lbs_setup_firmware(priv);