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imx8/sai: do not strangle the core with interrupts on underruns

--- a/sys/src/9/imx8/sai.c

+++ b/sys/src/9/imx8/sai.c

@@ -306,11 +306,10 @@

 			if(buffered(r) < 128*Byteps) /* having less than fifo buffered */

 				saistop(ctlr);

 			else if(fifo(ctlr, (128-Wmark)*Byteps) > 0)

-				v |= TCSR_TE;

+				wr(TCSR, v | TCSR_TE | TCSR_FEF);

 		}

 		wakeup(&r->r);

 	}

-	wr(TCSR, v | TCSR_FEF);

 	iunlock(ctlr);

 }