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devtls: allow larger than MaxRecLen (16k) writes

tlsbwrite() already handles atomic chunking into
MaxRecLen TLS records (sans the interrupt handling).

Now we can allow up to qiomaxatomic (64k) writes.

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

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

@@ -485,7 +485,17 @@

 	c->mode = openmode(omode);

 	c->flag |= COPEN;

 	c->offset = 0;

-	c->iounit = MaxRecLen;

+	switch(t){

+	case Qdata:

+		c->iounit = qiomaxatomic;

+		break;

+	case Qhand:

+		c->iounit = MaxRecLen;

+		break;

+	default:

+		c->iounit = 0;

+		break;

+	}

 	return c;

 }

@@ -1346,6 +1356,8 @@

 		if(waserror()){

 			if(strcmp(up->errstr, "interrupted") != 0)

 				tlsError(tr, "channel error");

+			else if(bb != nil)

+				continue;

 			nexterror();

 		}

 		devtab[tr->c->type]->bwrite(tr->c, nb, 0);

@@ -1592,6 +1604,7 @@

 			b->wp += m;

 			tlsbwrite(c, b, offset);

+			offset += m;

 			p += m;

 		}while(p < e);