Commit 64252c75 removed the useless dget from dentry_unhash but didn't
fix up this caller in the usb code.  There used to be exactly one dput per
dentry_unhash call; now there are none.
Tested-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NSage Weil <sage@newdream.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>