staging: wilc1000: wilc_frame_register: removes unused hif_drv

This patch removes unused hif_drv of wilc_frame_register function.
It's perform an unnecessary null check and debug print log.
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -3689,12 +3689,6 @@ int wilc_frame_register(struct wilc_vif *vif, u16 frame_type, bool reg)
 {
 	int result = 0;
 	struct host_if_msg msg;
-	struct host_if_drv *hif_drv = vif->hif_drv;
-
-	if (!hif_drv) {
-		netdev_err(vif->ndev, "driver is null\n");
-		return -EFAULT;
-	}
 
 	memset(&msg, 0, sizeof(struct host_if_msg));