[evolution-data-server] Fix a memory leak in ebmb_gather_photos_local_filenames()

[Milan Crha <mcrha src gnome org>]

commit 473b41ef6ce28b2d07b76c60854f7779a785f5f8
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jul 14 18:04:04 2020 +0200

    Fix a memory leak in ebmb_gather_photos_local_filenames()

 src/addressbook/libedata-book/e-book-meta-backend.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/addressbook/libedata-book/e-book-meta-backend.c 
b/src/addressbook/libedata-book/e-book-meta-backend.c
index ea79511fe..3cce96420 100644
--- a/src/addressbook/libedata-book/e-book-meta-backend.c
+++ b/src/addressbook/libedata-book/e-book-meta-backend.c
@@ -521,7 +521,7 @@ ebmb_gather_photos_local_filenames (EBookMetaBackend *meta_backend,
 
                values = e_vcard_attribute_get_param (attr, EVC_VALUE);
                if (values && g_ascii_strcasecmp (values->data, "uri") == 0) {
-                       const gchar *url;
+                       gchar *url;
 
                        url = e_vcard_attribute_get_value (attr);
                        if (url && g_str_has_prefix (url, LOCAL_PREFIX)) {
@@ -533,6 +533,8 @@ ebmb_gather_photos_local_filenames (EBookMetaBackend *meta_backend,
                                else
                                        g_free (filename);
                        }
+
+                       g_free (url);
                }
        }