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remove some dead stores

#include <wchar.h>

size_t mbsrtowcs(wchar_t *dest, const char **src, size_t len, mbstate_t *ps) {
  size_t i;
  if (!dest) len=(size_t)-1;
  for (i=0; i<len; ++i) {
    size_t n=mbrtowc(dest?dest+i:0,*src,len,ps);
    if (n==(size_t)-1) return -1;
    if (!n) break;
    *src+=n;
  }
  return i;
}