Added missing call to libgtop_init();

* df.c: (main):
	* pprint.c: (main):
	* procargs.c: (main): Added missing call to libgtop_init();

examples/pprint.c

@@ -216,6 +216,8 @@ static void pprint_get_uptime()
 
 int main()
 {
+  glibtop_init();
+
   pprint_get_cpu();
 
   pprint_get_fsusage("/");