tty/vt: consolemap: remove dflt reset from con_do_clear_unimap()

con_do_clear_unimap() sets dflt to NULL and then calls
con_release_unimap() which does the very same as the first thing. So
remove the former as it is apparently superfluous.
Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220614090537.15557-7-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/consolemap.c

@@ -563,8 +563,6 @@ static int con_do_clear_unimap(struct vc_data *vc)
 	if (!old || old->refcount > 1)
 		return con_allocate_new(vc);
 
-	if (old == dflt)
-		dflt = NULL;
 	old->sum = 0;
 	con_release_unimap(old);