Fix compilation issue detected by internal tool.

webrtc/modules/audio_processing/aec3/suppression_filter.cc

Index: webrtc/modules/audio_processing/aec3/suppression_filter.cc
diff --git a/webrtc/modules/audio_processing/aec3/suppression_filter.cc b/webrtc/modules/audio_processing/aec3/suppression_filter.cc
index f127acf9de309b556d7b4afe0271d976ba04e712..358aafbdfb3777f0a5cb8fe05076d9cd0a4dc1ee 100644
--- a/webrtc/modules/audio_processing/aec3/suppression_filter.cc
+++ b/webrtc/modules/audio_processing/aec3/suppression_filter.cc
@@ -60,6 +60,7 @@ const float kSqrtHanning[kFftLength] = {
 
 SuppressionFilter::SuppressionFilter(int sample_rate_hz)
     : sample_rate_hz_(sample_rate_hz),
+      fft_(),
       e_output_old_(NumBandsForRate(sample_rate_hz_)) {
   RTC_DCHECK(ValidFullBandRate(sample_rate_hz_));
   e_input_old_.fill(0.f);