* Resolve further warnings on GCC4.

* Enable -Werror on GCC4 builds as well (limited to the same selected targets).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29118 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/Window.cpp

@@ -1595,7 +1595,7 @@ void
 BWindow::SetPulseRate(bigtime_t rate)
 {
 	// TODO: What about locking?!?
-	if (rate < 0 || (rate == fPulseRate && !(rate == 0 ^ fPulseRunner == NULL)))
+	if (rate < 0 || (rate == fPulseRate && !((rate == 0) ^ (fPulseRunner == NULL))))
 		return;
 
 	fPulseRate = rate;