libsensors: close descriptors after use

ported from http://review.cyanogenmod.org/#/c/30115/

Change-Id: Ibdf964f7bb8395ae52978b0d0c1adfa37f3e0146
Tenderloin:  Cleaned up audio tags and added tinymix,etc back in

Change-Id: I683f011b0e065dad77d5cbfa6ca2a0943843ed81