Merge branch 'leak' into 'master'

Plug memory leak

Bumped into it while debugging mms-engine:
```
==14981== 72 bytes in 3 blocks are definitely lost in loss record 2,926 of 3,087
==14981==    at 0x483F380: malloc (vg_replace_malloc.c:296)
==14981==    by 0x515E083: g_malloc (gmem.c:104)
==14981==    by 0x51749B5: g_slice_alloc (gslice.c:1016)
==14981==    by 0x5191555: g_variant_alloc (gvariant-core.c:478)
==14981==    by 0x5191555: g_variant_new_from_children (gvariant-core.c:567)
==14981==    by 0x518F009: g_variant_builder_end (gvariant.c:3654)
==14981==    by 0x519083B: g_variant_valist_new (gvariant.c:4624)
==14981==    by 0x51909B7: g_variant_new_va (gvariant.c:4778)
==14981==    by 0x5190AD3: g_variant_new (gvariant.c:4717)
==14981==    by 0x111B3: org_nemomobile_mms_engine_complete_push (org.nemomobile.MmsEngine.c:2389)
==14981==    by 0x1491B: mms_engine_handle_push_notify (mms_engine.c:332)
==14981==    by 0x14A07: mms_engine_handle_push (mms_engine.c:359)
==14981==    by 0x5A4DA5B: ffi_call_VFP (in /usr/lib/libffi.so.5.0.10)
```
The leak was introduced in commit aec9288

See merge request !2

rpm/gdbus-no-reply-expected.patch

@@ -1,8 +1,18 @@
 diff --git a/gio/gdbusmethodinvocation.c b/gio/gdbusmethodinvocation.c
-index c6cab91..26c04ee 100644
+index c6cab91..35ab771 100644
 --- a/gio/gdbusmethodinvocation.c
 +++ b/gio/gdbusmethodinvocation.c
-@@ -479,6 +479,9 @@ g_dbus_method_invocation_return_value_internal (GDBusMethodInvocation *invocatio
+@@ -398,6 +398,9 @@ g_dbus_method_invocation_return_value_internal (GDBusMethodInvocation *invocatio
+   if (parameters == NULL)
+     parameters = g_variant_new_tuple (NULL, 0);
+
++  /* Make sure that we don't lose the reference, floating or not */
++  g_variant_ref_sink(parameters);
++
+   /* if we have introspection data, check that the signature of @parameters is correct */
+   if (invocation->method_info != NULL)
+     {
+@@ -479,6 +482,9 @@ g_dbus_method_invocation_return_value_internal (GDBusMethodInvocation *invocatio
          g_assert_not_reached ();
      }
 
@@ -12,3 +22,11 @@ index c6cab91..26c04ee 100644
    if (G_UNLIKELY (_g_dbus_debug_return ()))
      {
        _g_dbus_debug_print_lock ();
+@@ -513,6 +519,7 @@ g_dbus_method_invocation_return_value_internal (GDBusMethodInvocation *invocatio
+   g_object_unref (reply);
+
+  out:
++  g_variant_unref(parameters);
+   g_object_unref (invocation);
+ }
+