[gupnp-igd] free GStaticMutex in AddRemoveData

[Olivier Crête <tester src gnome org>]

commit 761854febad29224c194fabb76c24f2701099c2f
Author: Matthew Waters <matthew centricular com>
Date:   Fri Nov 10 23:17:29 2017 +1100

    free GStaticMutex in AddRemoveData
    
    Fixes a memory leak reported by valgrind
    
     128 bytes in 16 blocks are definitely lost in loss record 6,923 of 7,784
        at 0x4C2CE5F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
        by 0x7AEAEB8: g_malloc (gmem.c:94)
        by 0x7B02A25: g_slice_alloc (gslice.c:1025)
        by 0x7AB6D9A: g_mutex_new (gthread-deprecated.c:1461)
        by 0x7AB70B4: g_static_mutex_get_mutex_impl (gthread-deprecated.c:524)
        by 0xBE6E74F: ??? (in /usr/lib/libgupnp-igd-1.0.so.4.2.0)
        by 0x7AE5784: g_main_dispatch (gmain.c:3182)
        by 0x7AE5784: g_main_context_dispatch (gmain.c:3847)
        by 0x7AE5B4F: g_main_context_iterate.isra.30 (gmain.c:3920)
        by 0x7AE5E61: g_main_loop_run (gmain.c:4116)
        by 0xBE6ED7D: ??? (in /usr/lib/libgupnp-igd-1.0.so.4.2.0)
        by 0x7B0D2A4: g_thread_proxy (gthread.c:784)
        by 0x8028089: start_thread (in /usr/lib/libpthread-2.26.so)
        by 0x833524E: clone (in /usr/lib/libc-2.26.so)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790165

 libgupnp-igd/gupnp-simple-igd-thread.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libgupnp-igd/gupnp-simple-igd-thread.c b/libgupnp-igd/gupnp-simple-igd-thread.c
index 8212f76..f38e9b7 100644
--- a/libgupnp-igd/gupnp-simple-igd-thread.c
+++ b/libgupnp-igd/gupnp-simple-igd-thread.c
@@ -450,6 +450,8 @@ free_add_remove_port_data (gpointer user_data)
   g_free (data->local_ip);
   g_free (data->description);
 
+  g_static_mutex_free (&data->mutex);
+
   g_slice_free (struct AddRemovePortData, data);
 }