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audio/mixfs: no loopback delay

--- a/sys/src/cmd/audio/mixfs/mixfs.c

+++ b/sys/src/cmd/audio/mixfs/mixfs.c

@@ -118,7 +118,7 @@

 					n = (long)(mixrp - s->rp);

 					if(n > NBUF && (s->used == 0 || sweep))

 						s->run = 0;

-					if(n >= NDELAY)

+					if(n > 0)

 						rwakeup(s);

 				}

 			}

@@ -202,7 +202,7 @@

 			s->run = 1;

 		}

 		m = (long)(mixrp - s->rp);

-		if(m < NDELAY){

+		if(m <= 0){

 			s->run = 1;

 			rsleep(s);

 			continue;