fft/example: cleaning up code
fft/example: cleaning up code

JayKickliter/liquid-dsp,jgaeddert/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,cjcliffe/liquid-dsp,andrepuschmann/liquid-dsp,wangning223/liquid-dsp,JayKickliter/liquid-dsp,jgaeddert/liquid-dsp,JayKickliter/liquid-dsp,cjcliffe/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,cjcliffe/liquid-dsp,cjcliffe/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,wangning223/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp,JayKickliter/liquid-dsp,biotrump/liquid-dsp,JayKickliter/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,jgaeddert/liquid-dsp,andrepuschmann/liquid-dsp,biotrump/liquid-dsp,cjcliffe/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp