Plug a memory leak.

Reviewed by:	mav
Sponsored by:	Nginx, Inc.
Add quirks to enable headphones redirection on number of Lenovo
laptops, namely X1, X1 Carbon, T420, T520.

PR:		misc/176656
Submitted by:	Hiren Panchasar <hiren.panchasara gmail.com>
Tested by:	glebius, X1 Carbon
Tested by:	osa, X1
Tested by:	Hiren Panchasar, T420
Tested by:	sbruno, T520
Reviewed by:	mav
Sponsored by:	Nginx, Inc.