media: coda: jpeg: add NULL check after kmalloc

Fixes coccicheck warning:

./drivers/media/platform/coda/coda-jpeg.c:331:3-31:
	alloc with no test, possible model on line 354

Add NULL check after kmalloc.
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/coda/coda-jpeg.c

@@ -327,8 +327,11 @@ int coda_jpeg_decode_header(struct coda_ctx *ctx, struct vb2_buffer *vb)
 				 "only 8-bit quantization tables supported\n");
 			continue;
 		}
-		if (!ctx->params.jpeg_qmat_tab[i])
+		if (!ctx->params.jpeg_qmat_tab[i]) {
 			ctx->params.jpeg_qmat_tab[i] = kmalloc(64, GFP_KERNEL);
+			if (!ctx->params.jpeg_qmat_tab[i])
+				return -ENOMEM;
+		}
 		memcpy(ctx->params.jpeg_qmat_tab[i],
 		       quantization_tables[i].start, 64);
 	}