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devtls, devssl: avoid ~0UL comparsion (from drawterm)

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

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

@@ -334,7 +334,7 @@

 	if(!emptystr(dir->uid))

 		kstrdup(&s->user, dir->uid);

-	if(dir->mode != ~0UL)

+	if(dir->mode != -1)

 		s->perm = dir->mode;

 	free(dir);

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

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

@@ -516,7 +516,7 @@

 		error(Eshortstat);

 	if(!emptystr(d->uid))

 		kstrdup(&tr->user, d->uid);

-	if(d->mode != ~0UL)

+	if(d->mode != -1)

 		tr->perm = d->mode;

 	free(d);