vl: remove bogus check

There is no reason to prevent -preconfig -daemonize.  Of course if
no monitor is defined there will be no way to start the VM,
but that is a user error.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

softmmu/vl.c

@@ -4032,12 +4032,6 @@ void qemu_init(int argc, char **argv, char **envp)
     }
 
     if (is_daemonized()) {
-        if (!preconfig_exit_requested) {
-            error_report("'preconfig' and 'daemonize' options are "
-                         "mutually exclusive");
-            exit(EXIT_FAILURE);
-        }
-
         /* According to documentation and historically, -nographic redirects
          * serial port, parallel port and monitor to stdio, which does not work
          * with -daemonize.  We can redirect these to null instead, but since