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rio: fix Xfidwrite memory leak on flush

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -411,6 +411,7 @@

 		case CWdata:

 			break;

 		case CWflush:

+			free(r);

 			filsyscancel(x);

 			return;

 		}

@@ -420,6 +421,7 @@

 		if(x->flushing){

 			qunlock(&x->active);

 			recv(x->flushc, nil);	/* wake up flushing xfid */

+			free(r);

 			pair.s = runemalloc(1);

 			pair.ns = 0;

 			send(cwm.cw, &pair);		/* wake up window with empty data */

-- 

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