[libgit2-glib] branch-enumerator: fix missing struct field init

[Alberto Fanjul <albfan src gnome org>]

commit 75e405a41f5b4954bc253168acbf12b8b4136871
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jan 28 14:52:38 2019 -0800

    branch-enumerator: fix missing struct field init
    
    This needs to be set to NULL so that it is not accidentially freed during
    a call to ggit_branch_enumerator_next().

 libgit2-glib/ggit-branch-enumerator.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgit2-glib/ggit-branch-enumerator.c b/libgit2-glib/ggit-branch-enumerator.c
index b127f53..9607278 100644
--- a/libgit2-glib/ggit-branch-enumerator.c
+++ b/libgit2-glib/ggit-branch-enumerator.c
@@ -19,6 +19,7 @@ _ggit_branch_enumerator_wrap (git_branch_iterator *iter)
        ret = g_slice_new (GgitBranchEnumerator);
        ret->ref_count = 1;
        ret->iterator = iter;
+       ret->ref = NULL;
 
        return ret;
 }