Code doesn't compile with DEBUG_MODE_DFT active

When activating DEBUG_MODE_DFT (incl. DEBUGGING and DEBUG_MODE_INFO), the code doesn't compile:

lib_enc/ivas_stereo_dft_enc.c: In function 'stereo_dft_calc_mean_ipd_change':
lib_enc/ivas_stereo_dft_enc.c:3300:44: error: 'hStereoDft' undeclared (first use in this function)
 3300 |     dbgwrite( ipd_change, sizeof( float ), hStereoDft->gipd_band_max, 1, "res/stereo_dft_ipd_change.pcm" );
      |                                            ^~~~~~~~~~
lib_enc/ivas_stereo_dft_enc.c:3300:44: note: each undeclared identifier is reported only once for each function it appears in