monitor: Improve and document client_migrate_info protocol error

Protocol must be spice, vnc isn't implemented.  Fix up documentation.

Attempts to use vnc or any other unknown protocol yield the misleading
error message "Invalid parameter 'protocol'".  Improve it to
"Parameter 'protocol' expects spice".

Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by. Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/monitor.c b/monitor.c
index 416ba10730..81703093f9 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1063,7 +1063,7 @@ static int client_migrate_info(Monitor *mon, const QDict *qdict,
         return 0;
     }
 
-    qerror_report(QERR_INVALID_PARAMETER, "protocol");
+    qerror_report(QERR_INVALID_PARAMETER_VALUE, "protocol", "spice");
     return -1;
 }