sandbox: trivial variable name change in cacosf test
sandbox: trivial variable name change in cacosf test

  * 'cosz' -> 'acosz'
  * avoid confusion

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