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devsegment: return proper write count for ctl message

--- a/sys/src/9/port/devsegment.c

+++ b/sys/src/9/port/devsegment.c

@@ -337,7 +337,7 @@

 			error(Ebadctl);

 		free(cb);

 		poperror();

-		break;

+		return n;

 	case Qdata:

 		return segio(g, g->s, a, n, voff, 0);

 	default: