Comment 18 for bug 1828102

Based on the below items, and the assumption that there is nobody currently available to actually manually verify this for disco, I'm marking this as verification-done-disco, although I have not personally verified it for disco. I leave it up to ~ubuntu-sru team to decide if this is enough to release the package to disco-updates.

1. existing verification of this patch for bionic (comment 14)

2. the modemmanager codebase being almost identical between bionic and disco:
 modemmanager | 1.10.0-1~ubuntu18.04.2 | bionic-updates | source, amd64, arm64, armhf, i386, ppc64el, s390x
 modemmanager | 1.10.0-1ubuntu0.19.04.1 | disco-proposed | source, amd64, arm64, armhf, i386, ppc64el, s390x
$ git diff --stat pkg/ubuntu/bionic-devel..pkg/ubuntu/disco-devel
 debian/changelog | 14 ++++++-------
 debian/libmm-glib0.symbols | 236 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------------------------------------------------------------------------------------------------------
 debian/patches/error-propagation-fix.patch | 2 +-
 3 files changed, 125 insertions(+), 127 deletions(-)

3. the simplicity and obviousness of the patch:
--- a/src/mm-broadband-modem.c
+++ b/src/mm-broadband-modem.c
@@ -8231,7 +8231,7 @@
     GError *inner_error = NULL;
     gboolean value;

- value = g_task_propagate_boolean (G_TASK (res), error);
+ value = g_task_propagate_boolean (G_TASK (res), &inner_error);
     if (inner_error) {
         g_propagate_error (error, inner_error);
         return FALSE;