fix code style

Author: a-tarasyuk

clang/lib/Sema/SemaDecl.cpp

@@ -8641,9 +8641,9 @@ void Sema::DiagnoseShadowingLambdaDecls(const LambdaScopeInfo *LSI) {
       Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
     } else if (isa<FieldDecl>(ShadowedDecl)) {
       if (CXXMethodDecl *MD =
-              dyn_cast<CXXMethodDecl>(getFunctionLevelDeclContext()))
-        if (MD->isExplicitObjectMemberFunction())
-          continue;
+              dyn_cast<CXXMethodDecl>(getFunctionLevelDeclContext());
+          MD && MD->isExplicitObjectMemberFunction())
+        continue;
 
       Diag(Shadow.VD->getLocation(),
            LSI->isCXXThisCaptured() ? diag::warn_decl_shadow