Added missing call to glibgtop_init() / glibtop_close()

* df.c: (main):
	* pprint.c: (main):
	* procargs.c: (main): Added missing call to glibgtop_init() / glibtop_close()

examples/df.c

@@ -42,5 +42,7 @@ int main()
 
   g_free(entries);
 
+  glibtop_close();
+
   return 0;
 }