Bug#904150: apache2: typo in maintainer script

[Andreas Hasenack <andreas@canonical.com>]

Package: apache2
Version: 2.4.33-3
Severity: normal

Dear Maintainer,

Tim Bishop filed this bug in Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1782806

showing what appears to be a typo in a maintainer script:
https://salsa.debian.org/apache-team/apache2/blob/master/debian/debhelper/apache2-maintscript-helper#L290

a2query -m "$mpm_$MPM" > /dev/null 2>&1 || a2query_ret=$?

The argument to -m was probably meant to be "mpm_$MPM", as the shell
function where this statement lives explicitly requests that the mpm
module name should not have a "mpm_" prefix.

The fix should be as simple as this:
--- a/debian/debhelper/apache2-maintscript-helper
+++ b/debian/debhelper/apache2-maintscript-helper
@@ -287,7 +287,7 @@ apache2_switch_mpm()
        fi

        local a2query_ret=0
-       a2query -m "$mpm_$MPM" > /dev/null 2>&1 || a2query_ret=$?
+       a2query -m "mpm_$MPM" > /dev/null 2>&1 || a2query_ret=$?

        case $a2query_ret in
        0)

Thanks!