mac80211: fix a crash issue introduced in the active monitor code

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 36751

package/mac80211/patches/300-pending_work.patch

@@ -3930,7 +3930,7 @@
  		change = true;
  	}
  
-+	if ((*flags & NL80211_MNTR_FLAG_ACTIVE) &&
++	if (flags && (*flags & NL80211_MNTR_FLAG_ACTIVE) &&
 +	    !(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR))
 +		return -EOPNOTSUPP;
 +