Fix memory leak causing soundfonts not to be deleted in delete_fluid_synth
Fix memory leak causing soundfonts not to be deleted in delete_fluid_synth

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