staging: wilc1000: Fix line over 80 characters

Break the line after '+' to remove the checkpatch.pl warning. Remove
trailing whitespace after '+' if any:
WARNING: line over 80 characters
Signed-off-by: Debleena Sen <idebleenasen@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -1253,7 +1253,8 @@ static int mgmt_tx(struct wiphy *wiphy,
 	struct wilc_priv *priv = wiphy_priv(wiphy);
 	struct host_if_drv *wfi_drv = priv->hif_drv;
 	struct wilc_vif *vif = netdev_priv(wdev->netdev);
-	u32 buf_len = len + sizeof(p2p_vendor_spec) + sizeof(priv->p2p.local_random);
+	u32 buf_len = len + sizeof(p2p_vendor_spec) +
+			sizeof(priv->p2p.local_random);
 	int ret = 0;
 
 	*cookie = prandom_u32();