pam: Fix crash when enumerating the devices

We don't need to free this by hand, it'll get freed when
we free the array itself.

pam/pam_fprintd.c

@@ -205,7 +205,6 @@ static DBusGProxy *open_device(pam_handle_t *pamh, DBusGConnection *connection,
 		dev = NULL;
 	}
 
-	g_strfreev ((char **)paths_array->pdata);
 	g_ptr_array_free (paths_array, TRUE);
 
 	return dev;