Stop/cp_stop_check newer style save_plug_in_value

Change-Id: I60c69f98ce20c37c3d90602d81d9b0b4428eebff
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/bin/plug_ins/Stop/cp_stop_check b/bin/plug_ins/Stop/cp_stop_check
index 5cad089..2bc8da8 100755
--- a/bin/plug_ins/Stop/cp_stop_check
+++ b/bin/plug_ins/Stop/cp_stop_check
@@ -106,8 +106,7 @@
     """
 
     if MASTER_PID != PROGRAM_PID:
-        stop_check_rc = stop_test_rc
-        save_plug_in_value(stop_check_rc)
+        save_plug_in_value(stop_check_rc=stop_test_rc)
     exit(stop_test_rc)