Initialize blacklist_path_length #9129
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For some reason, GCC warns[1]:
| ‘blacklist_path_length’ may be used uninitialized in this function
| [-Werror=maybe-uninitialized]
This looks like a false positive to me, but it doesn't hurt to
explicitly initialize the variable.
[1] https://github.com/php/php-src/runs/7502212969?check_suite_focus=true