cfg80211: fix a crash in dev lookup on dump commands
IS_ERR and PTR_ERR were called with the wrong pointer, leading to a crash when cfg80211_get_dev_from_ifindex fails. Signed-off-by:Felix Fietkau <nbd@openwrt.org> Acked-by:
Johannes Berg <johannes@sipsolutions.net> Signed-off-by:
John W. Linville <linville@tuxdriver.com>
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