staging: wilc1000: fix return type of wilc_add_rx_gtk declaration

This patch changes return type of wilc_add_rx_gtk declaration from s32
to int. The return type of this function declaration and definition
should be same as data type of int.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.h

@@ -317,7 +317,7 @@ int wilc_add_ptk(struct wilc_vif *vif, const u8 *ptk, u8 ptk_key_len,
 		 u8 mode, u8 cipher_mode, u8 index);
 s32 wilc_get_inactive_time(struct wilc_vif *vif, const u8 *mac,
 			   u32 *pu32InactiveTime);
-s32 wilc_add_rx_gtk(struct wilc_vif *vif, const u8 *pu8RxGtk, u8 u8GtkKeylen,
+int wilc_add_rx_gtk(struct wilc_vif *vif, const u8 *pu8RxGtk, u8 u8GtkKeylen,
 		    u8 u8KeyIdx, u32 u32KeyRSClen, const u8 *KeyRSC,
 		    const u8 *pu8RxMic, const u8 *pu8TxMic, u8 mode,
 		    u8 u8Ciphermode);