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As part of the refactoring in #5119, some vim_strchr() were changed to strchr(). However, vim_strchr() behaves differently than strchr() when c is NUL, returning NULL instead of a pointer to the NUL. Revert the strchr() calls where it isn't known whether c is NUL, since this causes a semantic change the surrounding code doesn't expect. In the case of #6650, this led to a heap overrun. Closes #6650