cfg80211: protect fools returning NULL in add_virtual_intf
Callback add_virtual_intf is supposed to return ERR_PTR and trying to return NULL results in some "Unable to handle kernel paging request", etc. As it may be complicated to debug & trace, let's catch it (WARN). Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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