Add debug for XModem transfer failure

TommyPROM/XModem.cpp

@@ -57,6 +57,7 @@ uint32_t XModem::ReceiveFile(uint32_t address)
             // Fail the transfer on anything else
             cmdStatus.error("Unexpected character received waiting for next packet.");
             cmdStatus.setValueDec(0, "char", c);
+            cmdStatus.setValueDec(1, "seq", seq);
             return 0;
             break;
         }