drm: Check the right variable when setting formats

When setting the video bus supported formats for a display device using
drm_display_info_set_bus_formats(), check for the proper variable after
duplicating memory.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDaniel Kurtz <djkurtz@chromium.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/drm_crtc.c

@@ -787,7 +787,7 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info,
 	if (formats && num_formats) {
 		fmts = kmemdup(formats, sizeof(*formats) * num_formats,
 			       GFP_KERNEL);
-		if (!formats)
+		if (!fmts)
 			return -ENOMEM;
 	}