Set the result status correctly for asynchronous step-in/out/over commands.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@156885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Commands/CommandObjectThread.cpp b/source/Commands/CommandObjectThread.cpp
index 040278b..7ecf740 100644
--- a/source/Commands/CommandObjectThread.cpp
+++ b/source/Commands/CommandObjectThread.cpp
@@ -543,6 +543,10 @@
                     result.AppendMessageWithFormat ("Process %llu %s\n", process->GetID(), StateAsCString (state));
                     result.SetStatus (eReturnStatusSuccessFinishNoResult);
                 }
+                else
+                {
+                    result.SetStatus (eReturnStatusSuccessContinuingNoResult);
+                }
             }
             else
             {