Description: media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2177389
 https://lore.kernel.org/linux-media/20221120065918.2160782-1-zhongbaisong@huawei.com/
 https://lore.kernel.org/lkml/CAO4mrfcPHB5aQJO=mpqV+p8mPLNg-Fok0gw8gZ=zemAfMGTzMg@mail.gmail.com/
Notes:
Bugs:
upstream: released (6.2-rc1) [0ed554fd769a19ea8464bb83e9ac201002ef74ad]
6.1-upstream-stable: released (6.1.2) [6b60cf73a931af34b7a0a3f467a79d9fe0df2d70]
5.10-upstream-stable: released (5.10.163) [559891d430e3f3a178040c4371ed419edbfa7d65]
4.19-upstream-stable: released (4.19.270) [7abfe467cd685f5da7ecb415441e45e3e4e2baa8]
sid: released (6.1.4-1)
5.10-bullseye-security: released (5.10.178-1)
4.19-buster-security: released (4.19.282-1)