CVE-2022-49496 media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko

In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko If the driver support subdev mode, the parameter "dev-pm.dev" will be NULL in mtkvcodecdecremove. Kernel will crash when try to rmmod mtk-vcodec-dec.ko...