wl1251: add channel to wl1251_cmd_join() parameters

Because join channel tunes to a channel, better to make it more obvious
by adding a parameter for it.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Reviewed-by: Vidhya Govindan <vidhya.govindan@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/wl12xx/wl1251_cmd.h b/drivers/net/wireless/wl12xx/wl1251_cmd.h
index ffeabf2..dff798ad 100644
--- a/drivers/net/wireless/wl12xx/wl1251_cmd.h
+++ b/drivers/net/wireless/wl12xx/wl1251_cmd.h
@@ -36,8 +36,8 @@
 int wl1251_cmd_vbm(struct wl1251 *wl, u8 identity,
 		   void *bitmap, u16 bitmap_len, u8 bitmap_control);
 int wl1251_cmd_data_path(struct wl1251 *wl, u8 channel, bool enable);
-int wl1251_cmd_join(struct wl1251 *wl, u8 bss_type, u16 beacon_interval,
-		    u8 dtim_interval);
+int wl1251_cmd_join(struct wl1251 *wl, u8 bss_type, u8 channel,
+		    u16 beacon_interval, u8 dtim_interval);
 int wl1251_cmd_ps_mode(struct wl1251 *wl, u8 ps_mode);
 int wl1251_cmd_read_memory(struct wl1251 *wl, u32 addr, void *answer,
 			   size_t len);