hostapd: Resolved compiler uninitialized warning

Resolved the below warning
../src/ap/ieee802_11.c:4535:25: warning: 'reply_res' may be used
uninitialized in this function [-Wmaybe-uninitialized]
  if (sta && ((reply_res != WLAN_STATUS_SUCCESS &&
		                           ^
Since reply_res is been assigned inside an if condition and so
compiler treats reply_res as uninitalized variable

Initialize reply_res with WLAN_STATUS_UNSPECIFIED_FAILURE.

Fixes: 5344af7d22 ("FT: Discard ReassocReq with mismatching RSNXE Used value")
Signed-off-by: Karthikeyan Kathirvel <kathirve@codeaurora.org>

src/ap/ieee802_11.c

@@ -4148,7 +4148,7 @@ static void handle_assoc(struct hostapd_data *hapd,
 {
 	u16 capab_info, listen_interval, seq_ctrl, fc;
 	int resp = WLAN_STATUS_SUCCESS;
-	u16 reply_res;
+	u16 reply_res = WLAN_STATUS_UNSPECIFIED_FAILURE;
 	const u8 *pos;
 	int left, i;
 	struct sta_info *sta;