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Fix hash table lookups: increment i when dead.

--- a/mbox.c

+++ b/mbox.c

@@ -154,7 +154,7 @@

 		m = mbox.mesg[i];

 		if(m == p)

 			break;

-		if(m->parent == nil){

+		if(m->flags & Ftoplev){

 			n += mbox.mesg[i]->nsub;

 			if(!(m->flags & Fdummy))

 				n++;

@@ -239,9 +239,7 @@

 		e = mbox.hash[i];

 		if(e == nil)

 			return nil;

-		if(e == &dead)

-			continue;

-		if(e->hash == h && strcmp(e->messageid, msgid) == 0)

+		if(e != &dead && e->hash == h && strcmp(e->messageid, msgid) == 0)

 			return e;

 		i = (i + 1) % mbox.hashsz;

 	}