staging: wlan-ng: Remove unused struct p80211macarray definition

struct p80211macarray is defined but is never used. Remove the unused
struct declaration.
Issue identified as part of coccicheck based code analysis.
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Suggested-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Deepak R Varma <drv@mailo.com>
Link: https://lore.kernel.org/r/b42eff9b8f73542bc9015948e5e4684416982e1b.1667308828.git.drv@mailo.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/p80211types.h

@@ -231,12 +231,6 @@ struct p80211pstr32 {
 	u8 data[MAXLEN_PSTR32];
 } __packed;
 
-/* MAC address array */
-struct p80211macarray {
-	u32 cnt;
-	u8 data[1][MAXLEN_PSTR6];
-} __packed;
-
 /* prototype template */
 struct p80211item {
 	u32 did;