[media] s5p-mfc: Correct check of vb2_dma_contig_init_ctx return value

vb2_dma_contig_init_ctx returns an error if failed, NULL check is not necessary.
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -1135,12 +1135,12 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 	}
 
 	dev->alloc_ctx[0] = vb2_dma_contig_init_ctx(dev->mem_dev_l);
-	if (IS_ERR_OR_NULL(dev->alloc_ctx[0])) {
+	if (IS_ERR(dev->alloc_ctx[0])) {
 		ret = PTR_ERR(dev->alloc_ctx[0]);
 		goto err_res;
 	}
 	dev->alloc_ctx[1] = vb2_dma_contig_init_ctx(dev->mem_dev_r);
-	if (IS_ERR_OR_NULL(dev->alloc_ctx[1])) {
+	if (IS_ERR(dev->alloc_ctx[1])) {
 		ret = PTR_ERR(dev->alloc_ctx[1]);
 		goto err_mem_init_ctx_1;
 	}