simplify one coverity fix issue

Signed-off-by: dsengupta0628 <dsengupta@precisioninno.com>

Author: dsengupta0628

liberty/Liberty.cc

@@ -2477,10 +2477,8 @@ bool
 LibertyPort::less(const LibertyPort *port1,
                   const LibertyPort *port2)
 {
-  if (port1 == nullptr && port2 != nullptr)
-    return true;
   if (port1 == nullptr || port2 == nullptr)
-    return false;
+    return port1 == nullptr && port2 != nullptr;
   const std::string &name1 = port1->name();
   const std::string &name2 = port2->name();
   if (name1 == name2) {