time-config: fix warning on no-effect conditional

operator<< (for iostream) has higher precidence than terinary
operator.  Therefore, 'cout << foo ? 1 : 2' would be evaluated
as '(cout << foo) ? 1 : 2' which is always true.

Add parens to ensure the correct evaluation order.

Change-Id: I24ce991ec934c35ca2b244677cacb1a5a738ad76
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/time-config.cpp b/time-config.cpp
index da54581..48bcbd4 100644
--- a/time-config.cpp
+++ b/time-config.cpp
@@ -528,7 +528,7 @@
     else
     {
         std::cout << "SUCCESS. NTP setting is now: " <<
-                  (ntpChangeOp) ? "Enabled" : "Disabled";
+                  ((ntpChangeOp) ? "Enabled" : "Disabled");
 
         // TODO : https://github.com/openbmc/phosphor-time-manager/issues/1
         if (ntpChangeOp)