python/qemu: split console from harness args

Before we mess with the console output lets create a new helper just
for that.

Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20260619155657.944220-3-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

python/qemu/machine/machine.py

@@ -306,7 +306,11 @@ def _harness_args(self) -> List[str]:
                 moncdev = f"socket,id=mon,path={self._monitor_address}"
             args.extend(['-chardev', moncdev, '-mon',
                          'chardev=mon,mode=control'])
+        return args
 
+    @property
+    def _console_args(self) -> List[str]:
+        args: List[str] = []
         for _ in range(self._console_index):
             args.extend(['-serial', 'null'])
         if self._console_set:
@@ -372,6 +376,7 @@ def _pre_launch(self) -> None:
             self._wrapper,
             [self._binary],
             self._harness_args,
+            self._console_args,
             self._base_args,
             self._args
         ))