[at-spi2-atk] Do not return without mutex unlock

[Mike Gorse <mgorse src gnome org>]

commit 493b5a1c83b248f382b677a4f1fbfb7e31f0dc4f
Author: Shinwoo Kim <cinoo kim samsung com>
Date:   Tue Feb 20 12:23:23 2018 +0900

    Do not return without mutex unlock
    
    It is not possible to use cache,
    after child_added_listener(or toplevel_added_listener) returns by calling
    g_return_val_if_fail, without g_rec_mutex_unlock.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=793625

 atk-adaptor/accessible-cache.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/atk-adaptor/accessible-cache.c b/atk-adaptor/accessible-cache.c
index 5065a00..a52a8e5 100644
--- a/atk-adaptor/accessible-cache.c
+++ b/atk-adaptor/accessible-cache.c
@@ -324,8 +324,6 @@ child_added_listener (GSignalInvocationHint * signal_hint,
 
   const gchar *detail = NULL;
 
-  g_rec_mutex_lock (&cache_mutex);
-
   /* 
    * Ensure that only accessibles already in the cache
    * have their signals processed.
@@ -333,6 +331,8 @@ child_added_listener (GSignalInvocationHint * signal_hint,
   accessible = ATK_OBJECT (g_value_get_object (&param_values[0]));
   g_return_val_if_fail (ATK_IS_OBJECT (accessible), TRUE);
 
+  g_rec_mutex_lock (&cache_mutex);
+
   if (spi_cache_in (cache, G_OBJECT(accessible)))
     {
 #ifdef SPI_ATK_DEBUG
@@ -378,10 +378,10 @@ toplevel_added_listener (AtkObject * accessible,
 {
   SpiCache *cache = spi_global_cache;
 
-  g_rec_mutex_lock (&cache_mutex);
-
   g_return_if_fail (ATK_IS_OBJECT (accessible));
 
+  g_rec_mutex_lock (&cache_mutex);
+
   if (spi_cache_in (cache, G_OBJECT(accessible)))
     {
 #ifdef SPI_ATK_DEBUG