introduce kref_put_mutex()

equivalent of
	mutex_lock(mutex);
	if (!kref_put(kref, release))
		mutex_unlock(mutex);

Change-Id: I05d61a7380eb29fbf12f634bcff5ac1072e13765
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mitchelh@codeaurora.org: trivial conflict due to moved code]
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
1 file changed