qelapsedtimer_win.cpp: Fix clang-tidy warning about else after return

Remove else in nelper nanosecondsToTicks()

Change-Id: I6c5291deaeb6651f702a9c118cabcb5a7edd179e
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qelapsedtimer_win.cpp

@@ -83,10 +83,9 @@ static inline qint64 nanosecondsToTicks(qint64 nsec)
     if (counterFrequency > 0) {
         // QueryPerformanceCounter uses an arbitrary frequency
         return double(nsec) * counterFrequency / 1000000000.;
-    } else {
-        // GetTickCount(64) uses milliseconds
-        return nsec / 1000000;
     }
+    // GetTickCount(64) uses milliseconds
+    return nsec / 1000000;
 }
 
 static quint64 getTickCount()