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resample: complete speex_resampler_reset_mem

Cherry-picked from speexdsp 91cc0a39e5098d0400c78e1c8a9ad874bec8611b

Signed-off-by: Tristan Matthews <tristan.matthews@savoirfairelinux.com>

--- a/src/resample.c

+++ b/src/resample.c

@@ -1122,6 +1122,12 @@

 SPX_RESAMPLE_EXPORT int speex_resampler_reset_mem(SpeexResamplerState *st)

 {

    spx_uint32_t i;

+   for (i=0;i<st->nb_channels;i++)

+   {

+      st->last_sample[i] = 0;

+      st->magic_samples[i] = 0;

+      st->samp_frac_num[i] = 0;

+   }

    for (i=0;i<st->nb_channels*(st->filt_len-1);i++)

       st->mem[i] = 0;

    return RESAMPLER_ERR_SUCCESS;