use page_to_pfn() in __blk_queue_bounce()

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__blk_queue_bounce() contains an open-coded page_to_pfn() for the
discontig, non-MAP_NR_DENSE() case (wherever MAP_NR_DENSE() went).
This converts it to use the standard page_to_pfn() abstraction.

-- wli

diff -urpN linux-2.5.66/mm/highmem.c merge-2.5.66-1/mm/highmem.c
--- linux-2.5.66/mm/highmem.c 2003-03-24 14:00:50.000000000 -0800
+++ merge-2.5.66-1/mm/highmem.c 2003-03-25 04:08:01.000000000 -0800
@@ -381,7 +381,7 @@ static void __blk_queue_bounce(request_q
                 /*
                  * is destination page below bounce pfn?
                  */
- if ((page - page_zone(page)->zone_mem_map) + (page_zone(page)->zone_start_pfn) < q->bounce_pfn)
+ if (page_to_pfn(page) < q->bounce_pfn)
                         continue;
 
                 /*
-
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