media: bdisp: Add missing check for create_workqueue

stable inclusion
from stable-v5.10.180
commit 4362444dca02ab44ac844feda3cf6238ef953673
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DDFN

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4362444dca02ab44ac844feda3cf6238ef953673



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[ Upstream commit 2371adea ]

Add the check for the return value of the create_workqueue
in order to avoid NULL pointer dereference.

Fixes: 28ffeebb ("[media] bdisp: 2D blitter driver using v4l2 mem2mem framework")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>