Fix spelling mistake.

llvm-svn: 295694
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
index a9615cb..3e5bc0a 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
@@ -609,7 +609,7 @@
 
     if (!object_ptr_error.Success()) {
       exe_ctx.GetTargetRef().GetDebugger().GetAsyncOutputStream()->Printf(
-          "warning: `%s' is not accessible (subsituting 0)\n",
+          "warning: `%s' is not accessible (substituting 0)\n",
           object_name.AsCString());
       object_ptr = 0;
     }