media: mediatek: vcodec: remove unneeded semicolon

Eliminate the following coccicheck warning:
./drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c:71:2-3: Unneeded semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>