ZVC: highmem.c Use page after it may have been freed

Another case: We cannot use the page after it has been freed.

Move the dec_zone_page_state before the free.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.17-mm2/mm/highmem.c
===================================================================
--- linux-2.6.17-mm2.orig/mm/highmem.c	2006-06-24 15:53:01.386239421 -0700
+++ linux-2.6.17-mm2/mm/highmem.c	2006-06-26 20:22:36.678900202 -0700
@@ -315,8 +315,8 @@ static void bounce_end_io(struct bio *bi
 		if (bvec->bv_page == org_vec->bv_page)
 			continue;
 
-		mempool_free(bvec->bv_page, pool);	
 		dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
+		mempool_free(bvec->bv_page, pool);
 	}
 
 	bio_endio(bio_orig, bio_orig->bi_size, err);