[lldb][NFC] Fix documentation for ClangPersistentVariables::m_next_persistent_variable_id

llvm-svn: 367857
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.cpp
index 742a149..38078fd 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.cpp
@@ -23,8 +23,7 @@
 using namespace lldb_private;
 
 ClangPersistentVariables::ClangPersistentVariables()
-    : lldb_private::PersistentExpressionState(LLVMCastKind::eKindClang),
-      m_next_persistent_variable_id(0) {}
+    : lldb_private::PersistentExpressionState(LLVMCastKind::eKindClang) {}
 
 ExpressionVariableSP ClangPersistentVariables::CreatePersistentVariable(
     const lldb::ValueObjectSP &valobj_sp) {