Fix GH-16184: UBSan address overflowed in ext/pcre/php_pcre.c

libpcre2 can return the special value -1 for a non-match.
In this case we get pointer overflow, although it doesn't matter i

Fix GH-16184: UBSan address overflowed in ext/pcre/php_pcre.c

libpcre2 can return the special value -1 for a non-match.
In this case we get pointer overflow, although it doesn't matter in
practice because the pointer will be in bounds and the copy length will
be 0. Still, we should fix the UBSAN warning.

Closes GH-16205.

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