CVE-2023-53425 media: platform: mediatek: vpu: fix NULL ptr dereference

In the Linux kernel, the following vulnerability has been resolved: media: platform: mediatek: vpu: fix NULL ptr dereference If pdev is NULL, then it is still dereferenced. This fixes this smatch warning: drivers/media/platform/mediatek/vpu/mtkvpu.c:570 vpuloadfirmware warn: address of NULL point...