staging: wilc1000: change return type to 'void' tcp ack filter functions

Use 'void' return type for below functions as they always return '0' and
their return value is not used by caller.
add_tcp_pending_ack()
update_tcp_session()
add_tcp_pending_ack()
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wlan.c

@@ -91,8 +91,8 @@ static void wilc_wlan_txq_add_to_head(struct wilc_vif *vif,
 
 #define NOT_TCP_ACK			(-1)
 
-static inline int add_tcp_session(struct wilc_vif *vif, u32 src_prt,
-				  u32 dst_prt, u32 seq)
+static inline void add_tcp_session(struct wilc_vif *vif, u32 src_prt,
+				   u32 dst_prt, u32 seq)
 {
 	struct tcp_ack_filter *f = &vif->ack_filter;
 
@@ -103,22 +103,20 @@ static inline int add_tcp_session(struct wilc_vif *vif, u32 src_prt,
 		f->ack_session_info[f->tcp_session].dst_port = dst_prt;
 		f->tcp_session++;
 	}
-	return 0;
 }
 
-static inline int update_tcp_session(struct wilc_vif *vif, u32 index, u32 ack)
+static inline void update_tcp_session(struct wilc_vif *vif, u32 index, u32 ack)
 {
 	struct tcp_ack_filter *f = &vif->ack_filter;
 
 	if (index < 2 * MAX_TCP_SESSION &&
 	    ack > f->ack_session_info[index].bigger_ack_num)
 		f->ack_session_info[index].bigger_ack_num = ack;
-	return 0;
 }
 
-static inline int add_tcp_pending_ack(struct wilc_vif *vif, u32 ack,
-				      u32 session_index,
-				      struct txq_entry_t *txqe)
+static inline void add_tcp_pending_ack(struct wilc_vif *vif, u32 ack,
+				       u32 session_index,
+				       struct txq_entry_t *txqe)
 {
 	struct tcp_ack_filter *f = &vif->ack_filter;
 	u32 i = f->pending_base + f->pending_acks_idx;
@@ -130,7 +128,6 @@ static inline int add_tcp_pending_ack(struct wilc_vif *vif, u32 ack,
 		txqe->ack_idx = i;
 		f->pending_acks_idx++;
 	}
-	return 0;
 }
 
 static inline void tcp_process(struct net_device *dev, struct txq_entry_t *tqe)