staging: wilc1000: removes potential null dereference

This patch removes the error reported by smatch.
 - wilc_wfi_cfgoperations.c:674 scan() error:
   potential null dereference 'strHiddenNetwork.net_info'.  (kmalloc returns null)
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -668,6 +668,8 @@ static int scan(struct wiphy *wiphy, struct cfg80211_scan_request *request)
 				kmalloc_array(request->n_ssids,
 					      sizeof(struct hidden_network),
 					      GFP_KERNEL);
+			if (!strHiddenNetwork.net_info)
+				return -ENOMEM;
 			strHiddenNetwork.n_ssids = request->n_ssids;