nl80211: clean up genlmsg_end uses
genlmsg_end() cannot fail, it just returns the length of the message. Thus, error handling for it is useless. While removing it, I also noticed a useless variable and removed this it as well. Signed-off-by: NJohannes Berg <johannes.berg@intel.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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