sna: Remove bogus assert that the connector is a zombie before reattaching

To know that the connector was unplugged before we discover it was
plugged back in again, requires handing the unplug notification in time.
This does not always happen and we may see the reattachment instead.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99432
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/sna/sna_display.c

@@ -5095,7 +5095,6 @@ sna_output_add(struct sna *sna, unsigned id, unsigned serial)
 			if (strcmp(output->name, name) == 0) {
 				assert(output->scrn == scrn);
 				assert(output->funcs == &sna_output_funcs);
-				assert(to_sna_output(output)->id == 0);
 				sna_output_destroy(output);
 				goto reset;
 			}