Correct copied error message

Patch by Remco Verhoef.

llvm-svn: 217312
diff --git a/lldb/source/Commands/CommandObjectMemory.cpp b/lldb/source/Commands/CommandObjectMemory.cpp
index 8144f48..486a5eb 100644
--- a/lldb/source/Commands/CommandObjectMemory.cpp
+++ b/lldb/source/Commands/CommandObjectMemory.cpp
@@ -1080,7 +1080,7 @@
       lldb::addr_t high_addr = Args::StringToAddress(&m_exe_ctx, command.GetArgumentAtIndex(1),LLDB_INVALID_ADDRESS,&error);
       if (high_addr == LLDB_INVALID_ADDRESS || error.Fail())
       {
-          result.AppendError("invalid low address");
+          result.AppendError("invalid high address");
           return false;
       }