mwifiex: endian bug in mwifiex_drv_change_adhoc_chan()

In mwifiex_drv_change_adhoc_chan() we pass channel to
mwifiex_bss_ioctl_ibss_channel() which sets the high 16 bits.  This
works on little endian systems but not on big endian ones.  I've changed
mwifiex_drv_change_adhoc_chan() to use a 16 bit variable.  This matches
the other functions in the file.

I considered changing mwifiex_change_adhoc_chan() as well but it turns
out that the function isn't implemented so I just removed the
definition.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index a0bd4eb..6dc1166 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -909,10 +909,9 @@
 			 struct cfg80211_ssid *req_ssid);
 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
 				struct mwifiex_user_scan_cfg *scan_req);
-int mwifiex_change_adhoc_chan(struct mwifiex_private *priv, int channel);
 int mwifiex_set_radio(struct mwifiex_private *priv, u8 option);
 
-int mwifiex_drv_change_adhoc_chan(struct mwifiex_private *priv, int channel);
+int mwifiex_drv_change_adhoc_chan(struct mwifiex_private *priv, u16 channel);
 
 int mwifiex_set_encode(struct mwifiex_private *priv, const u8 *key,
 		       int key_len, u8 key_index, int disable);