[epiphany] Fix build error caused by previous commit

[Gabriel Ivașcu <gabrielivascu src gnome org>]

commit a3e8fd0d4164c93558f5e86e8a60ac26e89d0e5a
Author: Gabriel Ivascu <gabrielivascu gnome org>
Date:   Thu Nov 16 13:56:31 2017 +0200

    Fix build error caused by previous commit

 lib/safe-browsing/ephy-gsb-service.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/safe-browsing/ephy-gsb-service.c b/lib/safe-browsing/ephy-gsb-service.c
index f5046a9..4ef2762 100644
--- a/lib/safe-browsing/ephy-gsb-service.c
+++ b/lib/safe-browsing/ephy-gsb-service.c
@@ -353,7 +353,7 @@ ephy_gsb_service_update_thread (GTask          *task,
 
     duration_str = json_object_get_string_member (body_obj, "minimumWaitDuration");
     /* g_ascii_strtod() ignores trailing characters, i.e. 's' character. */
-    duration = g_ascii_strtod (duration_str, &end);
+    duration = g_ascii_strtod (duration_str, NULL);
     self->next_list_updates_time = CURRENT_TIME + (gint64)ceil (duration);
   }