zlib: use zend_string_{extend,truncate} over *_realloc #18462
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These cases seemed obvious enough to me to confidently change as an outsider. There are a few more cases of zend_string_realloc still.
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These cases seemed obvious enough to me to confidently change as an outsider. There are a few more cases of zend_string_realloc still in other parts of the engine.
Note that
deflate_addis possibly missing azend_string_truncatestep at the end of it, similar to whatinflate_addhas. Or alternativelyinflate_addis doing an unnecessaryzend_string_truncate. They don't match, in any case.