wifi: mac80211: clean up a needless assignment in ieee80211_sta_activate_link()

Commit 177577dbd2 ("wifi: mac80211: sta_info: fix link_sta insertion")
makes ieee80211_sta_activate_link() return 0 in the 'hash' label case.
Hence, setting ret in the !test_sta_flag(...) branch to zero is not needed
anymore and can be dropped.

Remove a needless assignment.

No functional change. No change in object code.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220812103126.25308-1-lukas.bulwahn@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/sta_info.c

@@ -2778,10 +2778,8 @@ int ieee80211_sta_activate_link(struct sta_info *sta, unsigned int link_id)
 
 	sta->sta.valid_links = new_links;
 
-	if (!test_sta_flag(sta, WLAN_STA_INSERTED)) {
-		ret = 0;
+	if (!test_sta_flag(sta, WLAN_STA_INSERTED))
 		goto hash;
-	}
 
 	ret = drv_change_sta_links(sdata->local, sdata, &sta->sta,
 				   old_links, new_links);