Fix a copy-n-paste bug in the object decorator code.

Duh.

When I did the object decorator thing, I made the "loop over the hash"
function use the same logic for updating the hash, ie made them use

	if (++j >= size)
		j = 0;

for both the hash update for both "insert" and "lookup"

HOWEVER.

For some inexplicable reason I had an extraneous

	j++;

in the insert path (probably just from the fact that the old code there
used

	j++;
	if (j >= size)
		j = 0;

and when I made them use the same logic I just didn't remove the old
extraneous line properly.

This fixes it.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

decorate.c

@@ -24,7 +24,6 @@ static void *insert_decoration(struct decoration *n, struct object *base, void *
 			hash[j].decoration = decoration;
 			return old;
 		}
-		j++;
 		if (++j >= size)
 			j = 0;
 	}