Set local static variable to unused
Set local static variable to unused

GCC 5.x generates warnings if local static variable
is not used.

kuscsik/linaro-cdm,kuscsik/linaro-cdm,linaro-home/open-content-decryption-module,kuscsik/linaro-cdm,linaro-home/open-content-decryption-module,linaro-home/open-content-decryption-module,linaro-home/open-content-decryption-module