libfmjni: Remove unused variables

 * libfm_jni/FmPerformanceParams.cpp:
    443:16: error: unused variable 'sinr'

 * libfm_jni/ConfigFmThs.cpp:
    425:17: error: unused variable 'ret'
    433:9: error: unused variable 'value'
    566:9: error: unused variable 'index'

 * libfm_jni/ConfFileParser.cpp:
    328:16: error: unused variable 'num_of_keys'
    536:9: error: unused variable 'grp_name'
    537:16: error: unused variable 'len'
    732:13: error: unused function 'key_exist'

 * libfm_jni/FmRadioController.cpp:
    651:9: error: unused variable 'stationList

 * libfm_jni/FmPerformanceParams.cpp:
    442:16: error: unused variable 'sinr'

Change-Id: I9c4839d1bc8b64c536b8a7db7c2094001f2562ba
4 files changed