qapi: convert screendump

Next commits will update devices to propagate errors.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 5cee131..ed67e99 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -194,8 +194,7 @@
         .args_type  = "filename:F",
         .params     = "filename",
         .help       = "save screen into PPM image 'filename'",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_screen_dump,
+        .mhandler.cmd = hmp_screen_dump,
     },
 
 STEXI