CMake: Simplify code a little

Change-Id: Ifdfac9bb844c9ab201378a6047714ab64ccebd66
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -240,10 +240,7 @@ QStringList CMakeProject::getCXXFlagsFor(const CMakeBuildTarget &buildTarget, QB
 
 bool CMakeProject::parseCMakeLists()
 {
-    if (!activeTarget() ||
-        !activeTarget()->activeBuildConfiguration()) {
-        return false;
-    }
+    QTC_ASSERT(activeTarget() && activeTarget()->activeBuildConfiguration(), return false);
 
     CMakeBuildConfiguration *activeBC = static_cast<CMakeBuildConfiguration *>(activeTarget()->activeBuildConfiguration());
     foreach (Core::IDocument *document, Core::DocumentModel::openedDocuments())