HS 2.0R2: Clear fetch_anqp_in_progress if fopen fails

Clear wpa_s->fetch_anqp_in_progress when osu-providers.txt can't be
opened. An issue happens, for instance, when wpa_supplicant doesn't
have correct access permission to the directory specified by osu_dir.
If hs20_osu_fetch_done method returns without clearing the flag,
'FETCH_OSU' command will never work correctly.

Signed-off-by: Daichi Ueura <daichi.ueura@sonymobile.com>

wpa_supplicant/hs20_supplicant.c

@@ -664,6 +664,7 @@ static void hs20_osu_fetch_done(struct wpa_supplicant *wpa_s)
 	f = fopen(fname, "w");
 	if (f == NULL) {
 		hs20_free_osu_prov(wpa_s);
+		wpa_s->fetch_anqp_in_progress = 0;
 		return;
 	}