cfg80211: fix channel error on mesh join

Fix an error on mesh join when no channel has been
explicitly set beforehand.

Also remove a double semicolon.

Signed-off-by: Marco Porsch <marco.porsch@etit.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 3ee5a72..f9d6ce5 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -146,7 +146,8 @@
 		if (!setup->chandef.chan)
 			return -EINVAL;
 
-		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;;
+		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
+		setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
 	}
 
 	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))