loplugin:cstylecast

and improve the error message in the plugin

Change-Id: I8719832a48e14c132f463340fbbc537845f82b0b

compilerplugins/clang/cstylecast.cxx

@@ -198,7 +198,7 @@ bool CStyleCast::VisitCStyleCastExpr(const CStyleCastExpr * expr) {
     report(
         DiagnosticsEngine::Warning, "%0 C-style cast from %1%2 to %3%4%5",
         expr->getSourceRange().getBegin())
-      << expr->getCastKindName() << incompFrom
+      << incompFrom
       << expr->getSubExprAsWritten()->getType() << incompTo << expr->getType()
       << performs << expr->getSourceRange();
     return true;