[libgit2-glib] Set correct native when setting email options author

[Ernestas Kulik <ernestask src gnome org>]

commit 0e1e1bc77190e565032139fe9617387d25f33498
Author: Ernestas Kulik <ernestask gnome org>
Date:   Sat May 6 13:45:53 2017 +0300

    Set correct native when setting email options author
    
    When setting the author for email options, the code makes a copy of the
    signature parameter, but takes the native of the original object, which
    can result in use-after-free when the original object is destroyed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777932

 libgit2-glib/ggit-diff-format-email-options.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgit2-glib/ggit-diff-format-email-options.c b/libgit2-glib/ggit-diff-format-email-options.c
index 96f824a..63e3a03 100644
--- a/libgit2-glib/ggit-diff-format-email-options.c
+++ b/libgit2-glib/ggit-diff-format-email-options.c
@@ -536,7 +536,7 @@ ggit_diff_format_email_options_set_author (GgitDiffFormatEmailOptions *options,
        if (author)
        {
                priv->author = ggit_signature_copy (author);
-               priv->options.author = _ggit_native_get (author);
+               priv->options.author = _ggit_native_get (priv->author);
        }
 
        g_object_notify (G_OBJECT (options), "author");