wifi: cfg80211: Set SSID if it is not already set

When a connection was established without going through
NL80211_CMD_CONNECT, the ssid was never set in the wireless_dev struct.
Now we set it in __cfg80211_connect_result() when it is not already set.

When using a userspace configuration that does not call
cfg80211_connect() (can be checked with breakpoints in the kernel),
this patch should allow `networkctl status device_name` to output the
SSID instead of null.

Cc: stable@vger.kernel.org
Reported-by: Yohan Prod'homme <kernel@zoddo.fr>
Fixes: 7b0a0e3c (wifi: cfg80211: do some rework towards MLO link APIs)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216711


Signed-off-by: Marc Bornand <dev.mbornand@systemb.ch>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>