mac80211: Fix compilation warning when CONFIG_INET is not set

The warning is:
  net/mac80211/main.c:688: warning: label ‘fail_ifa’ defined but not used

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 7cc4f91..798a91b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -685,10 +685,12 @@
 
 	return 0;
 
+#ifdef CONFIG_INET
  fail_ifa:
 	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 			       &local->network_latency_notifier);
 	rtnl_lock();
+#endif
  fail_pm_qos:
 	ieee80211_led_exit(local);
 	ieee80211_remove_interfaces(local);