drm/msm/dsi: fix error return code in msm_dsi_host_init()

Fix to return error code -ENOMEM from the malloc error handling
case instead of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170209151907.28800-1-weiyj.lk@gmail.com

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -1743,6 +1743,7 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 
 	msm_host->rx_buf = devm_kzalloc(&pdev->dev, SZ_4K, GFP_KERNEL);
 	if (!msm_host->rx_buf) {
+		ret = -ENOMEM;
 		pr_err("%s: alloc rx temp buf failed\n", __func__);
 		goto fail;
 	}