gnu: telepathy-glib: Fix test failure.

* gnu/packages/patches/telepathy-glib-channel-memory-leak.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/glib.scm (telepathy-glib)[source](patches): Add it.

gnu/local.mk

@@ -1435,6 +1435,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/texinfo-5-perl-compat.patch		\
   %D%/packages/patches/texlive-bin-poppler-0.83.patch		\
   %D%/packages/patches/telegram-purple-adjust-test.patch	\
+  %D%/packages/patches/telepathy-glib-channel-memory-leak.patch	\
   %D%/packages/patches/texi2html-document-encoding.patch	\
   %D%/packages/patches/texi2html-i18n.patch			\
   %D%/packages/patches/thefuck-test-environ.patch		\

gnu/packages/glib.scm

@@ -805,6 +805,7 @@ up the Gnome environment, and are used in many unrelated projects.")
          "1symyzbjmxvksn2ifdkk50lafjm2llf2sbmky062gq2pz3cg23cy"))
        (patches
         (list
+         (search-patch "telepathy-glib-channel-memory-leak.patch")
          ;; Don't use the same test name for multiple tests.
          ;; <https://bugs.freedesktop.org/show_bug.cgi?id=92245>
          (origin

gnu/packages/patches/telepathy-glib-channel-memory-leak.patch

@@ -0,0 +1,19 @@
+Prevent a memory leak in call-channel, which otherwise would cause a
+test failure in file-transfer-channel.c.
+
+Taken from upstream:
+https://gitlab.freedesktop.org/telepathy/telepathy-glib/commit/2e8b2cc0db09b781d99e3755bb6d01548037fe7b
+
+diff --git a/telepathy-glib/call-channel.c b/telepathy-glib/call-channel.c
+index 8ed76323be32f83c5f4d6045a50bc1698d8093fd..2a1fa203d4be9f0c8b99344225f4ba9900666ffc 100644
+--- a/telepathy-glib/call-channel.c
++++ b/telepathy-glib/call-channel.c
+@@ -525,6 +525,8 @@ update_call_members (TpCallChannel *self,
+ 
+   _tp_channel_contacts_queue_prepare_async ((TpChannel *) self,
+       contacts, update_call_members_prepared_cb, data);
++
++  g_ptr_array_unref (contacts);
+ }
+ 
+ static void