wl1251: initialise default channel to zero

Because wl->channel was initialised to one, the first join command in
wl1251_op_config() always failed.

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>

drivers/net/wireless/wl12xx/wl1251.h

@@ -398,6 +398,8 @@ void wl1251_disable_interrupts(struct wl1251 *wl);
 #define WL1251_DEFAULT_BEACON_INT 100
 #define WL1251_DEFAULT_DTIM_PERIOD 1
 
+#define WL1251_DEFAULT_CHANNEL 0
+
 #define CHIP_ID_1251_PG10	           (0x7010101)
 #define CHIP_ID_1251_PG11	           (0x7020101)
 #define CHIP_ID_1251_PG12	           (0x7030101)