dma-buf: remove dma_buf directory on bufinfo file creation errors

Change the error handling in dma_buf_init_debugfs() to remove the
"dma_buf" directory if creating the "bufinfo" file fails. No need to
have an empty debugfs directory around.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

drivers/dma-buf/dma-buf.c

@@ -907,8 +907,11 @@ static int dma_buf_init_debugfs(void)
 
 	err = dma_buf_debugfs_create_file("bufinfo", NULL);
 
-	if (err)
+	if (err) {
 		pr_debug("dma_buf: debugfs: failed to create node bufinfo\n");
+		debugfs_remove_recursive(dma_buf_debugfs_dir);
+		dma_buf_debugfs_dir = NULL;
+	}
 
 	return err;
 }