CMakeBuildStep: Remove dead code

Change-Id: I3ba8d5ece263f19c0b129e9de81888c9016583a5
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildstep.cpp

@@ -225,9 +225,6 @@ bool CMakeBuildStep::init()
 void CMakeBuildStep::doRun()
 {
     // Make sure CMake state was written to disk before trying to build:
-    CMakeBuildConfiguration *bc = cmakeBuildConfiguration();
-    QTC_ASSERT(bc, return);
-
     m_waiting = false;
     auto bs = static_cast<CMakeBuildSystem *>(buildSystem());
     if (bs->persistCMakeState()) {