setup_paths leaks memory: realpath is already set in mx_open_mailbox()
restore_paths is unneeded. mx_fastclose_mailbox() will free stuff,
and nothing is looking at the path once we are closing or aborting.
Make a copy of the hooks. Otherwise 'unhook *' will leave dangling
pointers.
Add compress_info freeing inside mx_fastclose_mailbox(). Only free
inside compress.c when we want to prevent close() from doing anything.
close_mailbox() didn't preserve ctx->path on error.
execute_command() didn't return an error if the mutt_system() command
failed.
mx_open_mailbox_append() should check mutt_comp_can_append() only for
the case that the mailbox doesn't exist. When it exists,
mx_get_magic() has already looked at the file contents before checking
for matching open_hooks.
In open_append_mailbox() if no append hook is defined, it should't
call ci->open() if the mailbox doesn't exist. It should act just like
append and create a temporary file.
check_mailbox() needs more work. For now, at least have it properly
close the mailbox on error.