driver: staging: wlan-ng: Setting character pointers as const

changed declaration of ctlx_str to:
static const char * const ctlx_str[]
Signed-off-by: Sherif Shehab Aldin <shehabaldin.sherif@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/hfa384x_usb.c

@@ -272,7 +272,7 @@ static int hfa384x_isgood_pdrcode(u16 pdrcode);
 
 static inline const char *ctlxstr(CTLX_STATE s)
 {
-	static const char *ctlx_str[] = {
+	static const char * const ctlx_str[] = {
 		"Initial state",
 		"Complete",
 		"Request failed",