usb: remove bad dput after dentry_unhash

Commit 64252c75a (vfs: remove dget() from dentry_unhash()) 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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 1b125c2..2278dad 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -389,7 +389,6 @@
 	mutex_unlock(&inode->i_mutex);
 	if (!error)
 		d_delete(dentry);
-	dput(dentry);
 	return error;
 }