gcode: Fix regression causing lost asynchronous commands

Commit d0932009 introduced an error that could cause lost input in
cases where the sender did not wait for an "ok" message before sending
the next command.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/gcode.py

@@ -132,7 +132,8 @@ class GCodeParser:
                 self.cmd_M112({})
             self.reactor.unregister_fd(self.fd_handle)
             self.fd_handle = None
-            return
+            while self.is_processing_data:
+                eventtime = self.reactor.pause(eventtime + 0.100)
         self.is_processing_data = True
         self.process_commands(lines)
         self.is_processing_data = False