fix memory leak in fluid_alsa.c, fix #147
fix memory leak in fluid_alsa.c, fix #147

FluidSynth/fluidsynth,FluidSynth/fluidsynth,nezticle/fluidsynth,nezticle/fluidsynth,nezticle/fluidsynth,FluidSynth/fluidsynth,FluidSynth/fluidsynth,nezticle/fluidsynth