cfg80211: fix indentation

checkpatch pointed out an issue, fix it.
Signed-off-by: Hila Gonen <hila.gonen@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/scan.c

@@ -815,7 +815,7 @@ cfg80211_inform_bss_frame(struct wiphy *wiphy,
 		return NULL;
 
 	if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
-	            (signal < 0 || signal > 100)))
+		    (signal < 0 || signal > 100)))
 		return NULL;
 
 	if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))