memory leak when cloning a repository

Hi,

I recently ran into a memory leak that appears consistently when I clone a repository:

================================================================= ==581989==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 27168 byte(s) in 1 object(s) allocated from:
    #0 0x7f0e100e6f2b in malloc (/lib64/libasan.so.8+0xe6f2b) (BuildId: 25975f766867e9e604dc5a71a8befeaed3301942)
    #1 0x00000122ab77 in git_mmap ../compat/mmap.c:15
    #2 0x000001169466 in xmmap_gently ../wrapper.c:884
    #3 0x00000116959b in xmmap ../wrapper.c:907
    #4 0x000000d168fd in check_packed_git_idx ../packfile.c:179
    #5 0x000000d16cce in open_pack_index ../packfile.c:282
    #6 0x000000d25273 in find_pack_entry_one ../packfile.c:2078
    #7 0x00000099f969 in check_connected ../connected.c:148
    #8 0x0000004dabdb in update_remote_refs ../builtin/clone.c:550
    #9 0x0000004dabdb in cmd_clone ../builtin/clone.c:1602
    #10 0x00000080a9b4 in run_builtin ../git.c:506
    #11 0x00000080a9b4 in handle_builtin ../git.c:780
    #12 0x000000810727 in run_argv ../git.c:863
    #13 0x000000810727 in cmd_main ../git.c:985
    #14 0x000000449e6f in main ../common-main.c:9
    #15 0x7f0e0f6105b4 in __libc_start_call_main (/lib64/libc.so.6+0x35b4) (BuildId: ff0267465bc3d76e21003b3bc5598fd5ee63e261)
    #16 0x7f0e0f610667 in __libc_start_main@@GLIBC_2.34 (/lib64/libc.so.6+0x3667) (BuildId: ff0267465bc3d76e21003b3bc5598fd5ee63e261)
    #17 0x00000044c264 in _start (/home/jekeller/libexec/git-core/git+0x44c264) (BuildId: f75e04052d9435ea15ebf4480b490fe2eb150d92)

SUMMARY: AddressSanitizer: 27168 byte(s) leaked in 1 allocation(s).

I tried digging into why this leak occurs but so far I don't have a good idea.

This happens when running on next: 7842e34a6654 ("Sync with 'master'")

Thanks, Jake