Bug#1112499: mariadb-server: ExecStartPost fails with "/usr/share/mysql/debian-start.inc.sh: line 87: MARIADB: unbound variable"

[Otto Kekäläinen]

Thanks for reporting!

Variable name is indeed wrongly cherry-picked, will fix it now. Weird that
our CI didn't catch this despite it starting and running the server in
every test.