dma-buf: Check return value of anon_inode_getfile

anon_inode_getfile might fail, so check its return value.
Signed-off-by: NTuomas Tynkkynen <ttynkkynen@nvidia.com>
Signed-off-by: NSumit Semwal <sumit.semwal@linaro.org>

drivers/base/dma-buf.c

@@ -133,7 +133,10 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,
 	dmabuf->exp_name = exp_name;
 
 	file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags);
-
+	if (IS_ERR(file)) {
+		kfree(dmabuf);
+		return ERR_CAST(file);
+	}
 	dmabuf->file = file;
 
 	mutex_init(&dmabuf->lock);