fix fd leak in memtrack.msm8960

Close smaps_fd when exiting function.

Bug: 11007903
Change-Id: I4a9fcd1e84aae195d229e5dd11f99ccb9f6f5006
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_hardware_qcom_display-caf into cm-11.0