Fix memory leak in minizip's zipOpen3 function

[amarkowski999]

Summary

When zipOpen3() is called with APPEND_STATUS_ADDINZIP and LoadCentralDirectoryRecord() fails after partially reading the central directory, the error path leaks the datablock list and the file stream. Fixes #1223.

Root Cause

The zipOpen3() error path freed ziinit.globalcomment and zi, but never called free_linkedlist(&ziinit.central_dir). The filestream was also only closed on LoadCentralDirectoryRecord()'s early-return path, not on its final error return, so it leaked on the later seek/read failures.

Fix

• LoadCentralDirectoryRecord(): close the filestream on its final error return, matching the existing early-error handling.
• zipOpen3(): call free_linkedlist(&(ziinit.central_dir)) on the error path.

Verification

ASan before:

=================================================================
==113671==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4112 byte(s) in 1 object(s) allocated from:
    #1 0x... in allocate_new_datablock zip.c:210
    #2 0x... in add_data_in_datablock zip.c:248
    #3 0x... in LoadCentralDirectoryRecord zip.c:1046
    #4 0x... in zipOpen3 zip.c:1113
SUMMARY: AddressSanitizer: 4112 byte(s) leaked in 1 allocation(s).

After: no leak, and the leaked file descriptor count returns to baseline.