Cache the result value because after Quit() fResult member is no more available.

Should fix #6675.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38845 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/print/drivers/pdf/source/PageSetupWindow.cpp

@@ -355,11 +355,16 @@ PageSetupWindow::Go()
 {
 	MoveTo(300,300);
 	Show();
-	acquire_sem(fExitSem);
-	Lock();
-	Quit();
 
-	return fResult;
+	while (acquire_sem(fExitSem) == B_INTERRUPTED) {
+	}
+
+	// Have to cache the value since we delete ourself on Quit()
+	status_t result = fResult;
+	if (Lock())
+		Quit();
+
+	return result;
 }