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libsec: add parentesis to squelch gcc warning in drawterm

not a bug, just make it easier to keep drawtem code and libsec
in sync...

--- a/sys/src/libsec/port/aes.c

+++ b/sys/src/libsec/port/aes.c

@@ -1247,7 +1247,7 @@

 		nkey = AESmaxkey;

 	memmove(s->key, key, nkey);

 	s->keybytes = nkey;

-	s->ekey = s->storage+16 - (s->storage - (uchar*)0 & 15);

+	s->ekey = s->storage+16 - ((s->storage - (uchar*)0) & 15);

 	s->dkey = (uchar*)s->ekey + 16*(AESmaxrounds+1);

 	s->rounds = (*aes_setup)(s->ekey, s->dkey, s->key, nkey);

 	if(ivec != nil)