Mariabackup core dump

[@lbutlr]

<https://jira.mariadb.org/browse/MDEV-15996>

This was posted 3 years ago, and I am having the identical issue. From what I can see on that page, no activity has taken place. Anyone have any ideas?

(It does seem to work fine if you give the full path, but needless to say, I'm slightly concerned about that error)

-- 
Windle shook his head sadly. Five exclamation marks, the sure sign of
	an insane mind. --Reaper Man