[patch] drm/omap: checking for NULL instead of IS_ERR()

[Dan Carpenter]

We recently start using the new drm_fb_helper functions but the error
handling needs to be updated as well to check for IS_ERR() instead of
NULL.

Fixes: 377eb331375f ('drm/omap: Use new drm_fb_helper functions')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c 
b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index 08ef090..b8e4cde 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -180,9 +180,9 @@ static int omap_fbdev_create(struct drm_fb_helper *helper,
        mutex_lock(&dev->struct_mutex);

        fbi = drm_fb_helper_alloc_fbi(helper);
-       if (!fbi) {
+       if (IS_ERR(fbi)) {
                dev_err(dev->dev, "failed to allocate fb info\n");
-               ret = -ENOMEM;
+               ret = PTR_ERR(fbi);
                goto fail_unlock;
        }