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devtls, devssl: make sure channel has ORDWR mode and is not a mount chan on fdtochan()

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

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

@@ -1436,7 +1436,7 @@

 	fd = strtoul(p, 0, 0);

 	if(fd < 0)

 		error(Ebadarg);

-	c = fdtochan(fd, -1, 0, 1);	/* error check and inc ref */

+	c = fdtochan(fd, ORDWR, 1, 1);	/* error check and inc ref */

 	if(devtab[c->type] == &ssldevtab){

 		cclose(c);

 		error("cannot ssl encrypt devssl files");

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

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

@@ -1872,7 +1872,7 @@

 	fd = strtoul(p, 0, 0);

 	if(fd < 0)

 		error(Ebadarg);

-	c = fdtochan(fd, -1, 0, 1);	/* error check and inc ref */

+	c = fdtochan(fd, ORDWR, 1, 1);	/* error check and inc ref */

 	return c;

 }