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Silence Clang 13+ null-pointer-subtraction warning

--- a/celt/pitch.c

+++ b/celt/pitch.c

@@ -258,7 +258,7 @@

    opus_val32 maxcorr=1;

 #endif

    celt_assert(max_pitch>0);

-   celt_sig_assert((((unsigned char *)_x-(unsigned char *)NULL)&3)==0);

+   celt_sig_assert(((size_t)_x&3)==0);

    for (i=0;i<max_pitch-3;i+=4)

    {

       opus_val32 sum[4]={0,0,0,0};