wifi: mac80211: remove redundant ML element check

If "ml_basic" is assigned, we already know that the type
of ML element is basic, so we don't need to check again,
that check can never happen. Simplify the code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240102213313.bb9b636e66f6.I7fc0897022142d46f39ac0b912a4f7b0f1b6ea26@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>