Fix estimated throughput based skip-roam case

Commit 8d1e693186336f85bf5d86bd094b5c9bd6f8fd02 ('Use estimated
throughput to avoid signal based roaming decision') added a check for
the current BSS estimated throughput being significantly higher than the
selected BSS estimated throughput. However, this case for skipping a
roam used "return 1" which actually allows the roam. Fix this by
returning 0 in this case.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/events.c

@@ -1561,7 +1561,7 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
 	if (current_bss->est_throughput > selected->est_throughput + 5000) {
 		wpa_dbg(wpa_s, MSG_DEBUG,
 			"Skip roam - Current BSS has better estimated throughput");
-		return 1;
+		return 0;
 	}
 
 	cur_est = current_bss->est_throughput;