Close adb_usb.ini after reading it

Signed-off-by: Chris Dearman <chris@mips.com>
Change-Id: I7d3ee8cbd54af206dac89225c438e6c7322c571f
corkscrew: Fix build with gcc 4.8

gcc 4.8 has a new warning for unused parameters - we need to override
-Werror on that.

Change-Id: Ia2a831a96750ae105440291c636b80382a5702fa
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>