[media] s5p-mfc: fix sparse error

s5p_mfc_enc.c:1178:25: error: incompatible types in conditional expression (different base types)
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NKamil Debski <k.debski@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/s5p-mfc/s5p_mfc_enc.c

@@ -1175,7 +1175,7 @@ static int vidioc_reqbufs(struct file *file, void *priv,
 		if (reqbufs->count == 0) {
 			mfc_debug(2, "Freeing buffers\n");
 			ret = vb2_reqbufs(&ctx->vq_src, reqbufs);
-			s5p_mfc_hw_call(dev->mfc_ops, release_codec_buffers,
+			s5p_mfc_hw_call_void(dev->mfc_ops, release_codec_buffers,
 					ctx);
 			ctx->output_state = QUEUE_FREE;
 			return ret;