Fixed compiler warning in wavelet.c
Fixed compiler warning in wavelet.c

Change-Id: I84e6b1af75fe578a3132671f3c5e50fad8853a23

vmarkovtsev/veles.sound_feature_extraction,vmarkovtsev/veles.sound_feature_extraction,Samsung/veles.sound_feature_extraction,vmarkovtsev/veles.sound_feature_extraction,vmarkovtsev/veles.sound_feature_extraction,Samsung/veles.sound_feature_extraction,Samsung/veles.sound_feature_extraction,Samsung/veles.sound_feature_extraction