sclpconsole: Don't instantiate sclpconsole with -nodefaults

libvirt specifies nodefaults and creates an sclp console with special
parameters. Let qemu follow nodefaults and don't create an sclp
console if nodefaults is specified.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

vl.c

@@ -3652,6 +3652,7 @@ int main(int argc, char **argv, char **envp)
                 default_serial = 0;
                 default_parallel = 0;
                 default_virtcon = 0;
+                default_sclp = 0;
                 default_monitor = 0;
                 default_net = 0;
                 default_floppy = 0;