[PATCH 4.15 37/45] xhci: Fix NULL pointer in xhci debugfs

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Zhengjun Xing commit fa2dfd0ec22e0069c84dfae162972cbbc7c75488 upstream. Commit dde634057da7 ("xhci: Fix use-after-free in xhci debugfs") causes a null pointer

[PATCH 4.15 37/45] xhci: Fix NULL pointer in xhci debugfs

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Zhengjun Xing commit fa2dfd0ec22e0069c84dfae162972cbbc7c75488 upstream. Commit dde634057da7 ("xhci: Fix use-after-free in xhci debugfs") causes a null pointer dereference while fixing