arm64: dma-mapping: Do not pass data to gen_pool_set_algo()

gen_pool_first_fit_order_align() does not make use of additional data,
so pass plain NULL there.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/mm/dma-mapping.c

@@ -425,7 +425,7 @@ static int __init atomic_pool_init(void)
 
 		gen_pool_set_algo(atomic_pool,
 				  gen_pool_first_fit_order_align,
-				  (void *)PAGE_SHIFT);
+				  NULL);
 
 		pr_info("DMA: preallocated %zu KiB pool for atomic allocations\n",
 			atomic_pool_size / 1024);