[evolution] Correct memory leak of object returned by atk_object_ref_relation_set()

[Milan Crha <mcrha src gnome org>]

commit 248cb45e0b17fad9d7f988fb558e03d11b0dfaea
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jun 26 14:55:10 2018 +0200

    Correct memory leak of object returned by atk_object_ref_relation_set()

 src/calendar/gui/e-timezone-entry.c | 8 +++++++-
 src/e-util/e-dateedit.c             | 8 +++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/src/calendar/gui/e-timezone-entry.c b/src/calendar/gui/e-timezone-entry.c
index 6ef670f686..725780a1f3 100644
--- a/src/calendar/gui/e-timezone-entry.c
+++ b/src/calendar/gui/e-timezone-entry.c
@@ -130,10 +130,14 @@ timezone_entry_add_relation (ETimezoneEntry *timezone_entry)
                relation = atk_relation_set_get_relation_by_type (
                        set, ATK_RELATION_LABELLED_BY);
                /* check whether has a labelled_by relation already */
-               if (relation != NULL)
+               if (relation != NULL) {
+                       g_object_unref (set);
                        return;
+               }
        }
 
+       g_clear_object (&set);
+
        set = atk_object_ref_relation_set (a11y_timezone_entry);
        if (!set)
                return;
@@ -150,6 +154,8 @@ timezone_entry_add_relation (ETimezoneEntry *timezone_entry)
                                ATK_OBJECT (target_object));
                }
        }
+
+       g_clear_object (&set);
 }
 
 /* The arrow button beside the date field has been clicked, so we show the
diff --git a/src/e-util/e-dateedit.c b/src/e-util/e-dateedit.c
index 5aca100f7b..855d86406b 100644
--- a/src/e-util/e-dateedit.c
+++ b/src/e-util/e-dateedit.c
@@ -2089,10 +2089,14 @@ add_relation (EDateEdit *dedit,
                relation = atk_relation_set_get_relation_by_type (
                        set, ATK_RELATION_LABELLED_BY);
                /* check whether has a labelled_by relation already */
-               if (relation != NULL)
+               if (relation != NULL) {
+                       g_object_unref (set);
                        return;
+               }
        }
 
+       g_clear_object (&set);
+
        set = atk_object_ref_relation_set (a11yEdit);
        if (!set)
                return;
@@ -2109,6 +2113,8 @@ add_relation (EDateEdit *dedit,
                                        ATK_OBJECT (target_object));
                }
        }
+
+       g_clear_object (&set);
 }
 
 /* This sets the text in the date entry according to the current settings. */