Fix #78853: preg_match() may return integer > 1

Commit 54ebebd[1] optimized the match loop, but for this case it has
been overlooked, that we must only loop if we're doing global matchin

Fix #78853: preg_match() may return integer > 1

Commit 54ebebd[1] optimized the match loop, but for this case it has
been overlooked, that we must only loop if we're doing global matching.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=54ebebd686255c5f124af718c966edb392782d4a>

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