staging: wilc1000: added comments for 'hif_cs' mutex lock

Added comments for 'hif_cs' mutex to avoid checkpatch.pl reported
issues.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_netdevice.h

@@ -130,6 +130,7 @@ struct wilc {
 	spinlock_t txq_spinlock;
 	/*protect rxq_entry_t receiver queue*/
 	struct mutex rxq_cs;
+	/* lock to protect hif access */
 	struct mutex hif_cs;
 
 	struct completion cfg_event;