drm: Fix error handling in drm_legacy_addctx

{

	struct drm_ctx_list *ctx_entry;

	struct drm_ctx *ctx = data;

	int tmp_handle;

	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&

	    !drm_core_check_feature(dev, DRIVER_LEGACY))

		return -EOPNOTSUPP;

	ctx->handle = drm_legacy_ctxbitmap_next(dev);

	if (ctx->handle == DRM_KERNEL_CONTEXT) {

	tmp_handle = drm_legacy_ctxbitmap_next(dev);

	if (tmp_handle == DRM_KERNEL_CONTEXT) {

		/* Skip kernel's context and get a new one. */

		ctx->handle = drm_legacy_ctxbitmap_next(dev);

		tmp_handle = drm_legacy_ctxbitmap_next(dev);

	}

	DRM_DEBUG("%d\n", ctx->handle);

	if (ctx->handle < 0) {

	DRM_DEBUG("%d\n", tmp_handle);

	if (tmp_handle < 0) {

		DRM_DEBUG("Not enough free contexts.\n");

		/* Should this return -EBUSY instead? */

		return -ENOMEM;

		return tmp_handle;

	}

	ctx->handle = tmp_handle;

	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);

	if (!ctx_entry) {

		DRM_DEBUG("out of memory\n");