UPSTREAM: cfg80211: scan: fix RCU in cfg80211_add_nontrans_list()

The SSID pointer is pointing to RCU protected data, so we
need to have it under rcu_read_lock() for the entire use.
Fix this.

Bug: 254441685
Cc: stable@vger.kernel.org
Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning")
Link: https://lore.kernel.org/r/20210930131120.6ddfc603aa1d.I2137344c4e2426525b1a8e4ce5fca82f8ecbfe7e@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit a2083eeb119fb9307258baea9b7c243ca9a2e0b6)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ib08a5980936f8d3a2e0ddee2a591db9fe292789a