[ARM] twl4030 - leak fix

Trivial error path leak fix. Problem found by Daniel Marjamäki using
cppcheck

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>