drm/mgag200: fix error return code in mgag200fb_create()

Fix to return error code -ENOMEM from the vmalloc() error handling
case instead of 0, as done elsewhere in this function.

Fixes: aec9e12953e7 ("drm/mgag200: Fix error handling paths in fbdev driver")
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1471273431-6753-1-git-send-email-weiyj.lk@gmail.com

drivers/gpu/drm/mgag200/mgag200_fb.c

@@ -183,8 +183,10 @@ static int mgag200fb_create(struct drm_fb_helper *helper,
 	}
 
 	sysram = vmalloc(size);
-	if (!sysram)
+	if (!sysram) {
+		ret = -ENOMEM;
 		goto err_sysram;
+	}
 
 	info = drm_fb_helper_alloc_fbi(helper);
 	if (IS_ERR(info)) {