mac80211: allow retry of wifi setup if an iw interface add command fails

In some cases, spurious failures might be cleared by teardown and retry

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry-picked from commit 42dda0ed3e)

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -626,7 +626,7 @@ mac80211_iw_interface_add() {
 		rc="$?"
 	}
 
-	[ "$rc" != 0 ] && wireless_setup_failed INTERFACE_CREATION_FAILED
+	[ "$rc" != 0 ] && echo "Failed to create interface $ifname"
 	return $rc
 }