php:php-fuzz-mbstring: Use-of-uninitialized-value in tune_look_behind

Detailed Report: https://oss-fuzz.com/testcase?key=5689949945069568 Project: php Fuzzing Engine: libFuzzer Fuzz Target: php-fuzz-mbstring Job Type: libfuzzermsanphp Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: tunelookbehind tuneanchor tunetree Sanitizer:...