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devtls: fix wrong iounit

devtls writes are only atomic up to MaxRecLen as this is the
maximum payload size we put in a record application message.

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

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

@@ -499,7 +499,7 @@

 	c->mode = openmode(omode);

 	c->flag |= COPEN;

 	c->offset = 0;

-	c->iounit = qiomaxatomic;

+	c->iounit = MaxRecLen;

 	return c;

 }

@@ -1584,8 +1584,8 @@

 		e = p + n;

 		do{

 			m = e - p;

-			if(m > MaxRecLen)

-				m = MaxRecLen;

+			if(m > c->iounit)

+				m = c->iounit;

 			b = allocb(m);

 			if(waserror()){