FFT cleanup

Author: pschatzmann

src/AudioTools/AudioLibs/AudioFFT.h

@@ -230,15 +230,14 @@ class AudioFFTBase : public AudioStream {
       cfg.window_function_ifft->begin(cfg.length);
     }
 
-    int step_size = cfg.stride > 0 ? cfg.stride : cfg.length;
     bool is_valid_rxtx = false;
     if (cfg.rxtx_mode == TX_MODE || cfg.rxtx_mode == RXTX_MODE) {
       // holds last N bytes that need to be reprocessed
       stride_buffer.resize((cfg.length) * bytesPerSample());
       is_valid_rxtx = true;
     }
     if (cfg.rxtx_mode == RX_MODE || cfg.rxtx_mode == RXTX_MODE) {
-      rfft_data.resize(cfg.channels * bytesPerSample() * step_size);
+      rfft_data.resize(cfg.channels * bytesPerSample() * cfg.stride);
       rfft_add.resize(cfg.length);
       step_data.resize(cfg.stride);
       is_valid_rxtx = true;