[php-src] Issue #8136: ftp_nlist memory leak

Issue: https://github.com/php/php-src/issues/8136 Comment Author: pyrsmk I didn't know about valgrind, thanks! I will help a lot. Here's the summary: ``` ==11546== HEAP SUMMARY: ==11546== in use at exit: 2,191,374 bytes in 19,166 blocks ==11546== total heap usage: 21,419 allocs, 2,253 frees, 2,842,480 bytes allocated ==11546== ==11546== LEAK SUMMARY: ==11546== definitely lost: 24,672 bytes in 771 blocks ==11546== indirectly lost: 40 bytes in 1 blocks ==11546== possibly lost: 1,723,560 bytes in 13,611 blocks ==11546== still reachable: 443,102 bytes in 4,783 blocks ==11546== suppressed: 0 bytes in 0 blocks ``` I found that those results are stable between two runs with a different duration so it does not seems to come from ftp_nlist after all. I don't understand where this leak is. I'll dig this up more and will come back later.