fixup! Add negative test

Author: felipepiovezan

lldb/unittests/Process/gdb-remote/GDBRemoteCommunicationClientTest.cpp

@@ -650,3 +650,14 @@ TEST_F(GDBRemoteCommunicationClientTest, MultiMemReadSupported) {
   ASSERT_TRUE(client.GetMultiMemReadSupported());
   async_result.wait();
 }
+
+TEST_F(GDBRemoteCommunicationClientTest, MultiMemReadNotSupported) {
+  std::future<bool> async_result = std::async(std::launch::async, [&] {
+    StringExtractorGDBRemote qSupported_packet_request;
+    server.GetPacket(qSupported_packet_request);
+    server.SendPacket(";");
+    return true;
+  });
+  ASSERT_FALSE(client.GetMultiMemReadSupported());
+  async_result.wait();
+}