[gnome-maps] lib: Remove uninteded use of comma operator

[Marcus Lundblad <mlundblad src gnome org>]

commit a21b785eab5c5779a44c758c709a0f93800479a3
Author: Marcus Lundblad <ml update uu se>
Date:   Sun Nov 18 16:22:34 2018 +0100

    lib: Remove uninteded use of comma operator
    
    Fixes #133

 lib/maps-osm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/lib/maps-osm.c b/lib/maps-osm.c
index 2c06d2f..307a936 100644
--- a/lib/maps-osm.c
+++ b/lib/maps-osm.c
@@ -73,9 +73,9 @@ parse_tag (const xmlAttr *attrs, GHashTable *tags)
   for (cur_attr = attrs; cur_attr; cur_attr = cur_attr->next)
     {
       if (g_str_equal (cur_attr->name, "k"))
-        key = (char *) cur_attr->children->content, "";
+        key = (char *) cur_attr->children->content;
       else if (g_str_equal (cur_attr->name, "v"))
-        value = (char *) cur_attr->children->content, "";
+        value = (char *) cur_attr->children->content;
       else
         g_warning ("Unexpected tag property: %s\n", cur_attr->name);
     }