Staging: wlan-ng: Remove function prototype

This patch removes the function prototype for prism2mgmt_pstr2bytearea as
it is no longer needed.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/prism2mgmt.h

@@ -87,7 +87,6 @@ int prism2mgmt_autojoin(wlandevice_t *wlandev, void *msgp);
 * Prism2 data types
 ---------------------------------------------------------------*/
 /* byte area conversion functions*/
-void prism2mgmt_pstr2bytearea(u8 *bytearea, p80211pstrd_t *pstr);
 void prism2mgmt_bytearea2pstr(u8 *bytearea, p80211pstrd_t *pstr, int len);
 
 /* byte string conversion functions*/