Description: media: vidtv: Check for null return of vzalloc
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2123310
Notes:
 carnil> Introduced by f90cf6079bf6 ("media: vidtv: add a bridge
 carnil> driver") in 5.10-rc1.
Bugs:
upstream: released (5.18-rc1) [e6a21a14106d9718aa4f8e115b1e474888eeba44]
5.10-upstream-stable: released (5.10.110) [663e7a72871f89f7a10cc8d7b2f17f27c64e071d]
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.17.3-1)
5.10-bullseye-security: released (5.10.113-1)
4.19-buster-security: N/A "Vulnerable code not present"