mac80211: Fix scan RX processing oops
mac80211: Fix scan RX processing oops

ieee80211_bss_info_update() can return NULL. Verify that this is not the
case before calling ieee802111_rx_bss_put() which would trigger an oops
in interrupt context in atomic_dec_and_lock().

Signed-off-by: Jouni Malinen <b37c2052a78e20d17a47b6db54f61503c44d98ee@atheros.com>
Acked-by: Johannes Berg <8398eb9892c5ab2ff439ca0b5e4b0706dd9ebef9@sipsolutions.net>
Acked-by: Benoit Papillault <8991e311035067725ffdc82cfef219cbbb0a30fd@free.fr>
Signed-off-by: John W. Linville <2a53bac7a5d324865ef46ec4c38b2c0fba1456b4@tuxdriver.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs