Fix error message in migrate_set_capability HMP command

Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

hmp.c

@@ -892,7 +892,7 @@ void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict)
     qapi_free_MigrationCapabilityStatusList(caps);
 
     if (err) {
-        monitor_printf(mon, "migrate_set_parameter: %s\n",
+        monitor_printf(mon, "migrate_set_capability: %s\n",
                        error_get_pretty(err));
         error_free(err);
     }