mark the minimized autopkgtest as also allowing stderr, in the event of any error messages from blkid.

debian/changelog

@@ -3,6 +3,8 @@ livecd-rootfs (23.10.31) UNRELEASED; urgency=medium
   * blkid is unreliable in mount_image(), but this blkid call is only here
     for debugging, so ignore any failures (even if we don't understand
     them).  LP: #2034299.
+  * mark the minimized autopkgtest as also allowing stderr, in the event of
+    any error messages from blkid.
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 05 Sep 2023 12:29:24 -0700
 

debian/tests/control

@@ -4,4 +4,4 @@ Restrictions: needs-root isolation-machine allow-stderr
 
 Tests: minimized
 Depends: @, lsb-release
-Restrictions: needs-root isolation-machine
+Restrictions: needs-root isolation-machine allow-stderr