Fix the following coccinelle report:
drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c:963:6-31:
WARNING: Comparison to bool
Found using - Coccinelle (http://coccinelle.lip6.fr)
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
                        goto DECODE_ERROR;
                }
 
-               if (vp9_decode_end_proc(inst) != true) {
+               if (!vp9_decode_end_proc(inst)) {
                        mtk_vcodec_err(inst, "vp9_decode_end_proc");
                        ret = -EINVAL;
                        goto DECODE_ERROR;