WPS: Fix memory leak with wps_ie in wpa_bss_is_wps_candidate()
Fix possible memory leak in case if WPS is not enabled on the interface
for connection. This path was missed in commit
fae7b3726035b57a78aa552378fc5d15402b9ec1 ('WPS: Do not expire probable
BSSes for WPS connection').
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>