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Make use of CELT_MEMSET() in find_spectral_pitch()

--- a/libcelt/pitch.c

+++ b/libcelt/pitch.c

@@ -119,8 +119,7 @@

    X = _X;

    ALLOC(curve, n2, celt_mask_t);

-   for (i=0;i<lag;i++)

-      X[i] = 0;

+   CELT_MEMSET(X,0,lag);

    /* Sum all channels of the current frame and copy into X in bit-reverse order */

    for (c=0;c<C;c++)

    {

@@ -149,8 +148,7 @@

    /* Deferred allocation to reduce peak stack usage */

    ALLOC(_Y, lag, celt_word16_t);

    Y = _Y;

-   for (i=0;i<lag;i++)

-      Y[i] = 0;

+   CELT_MEMSET(Y,0,lag);

    /* Sum all channels of the past audio and copy into Y in bit-reverse order */

    for (c=0;c<C;c++)

    {