dma-pool: remove a __maybe_unused label in atomic_pool_expand

Move the #endif a line so that free_page label is only seen by the
compile pass when actually used.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chunhui He <hchunhui@mail.ustc.edu.cn>
Reviewed-by: Robin Murphy <roin.murphy@arm.com>

kernel/dma/pool.c

@@ -135,9 +135,9 @@ encrypt_mapping:
 remove_mapping:
 #ifdef CONFIG_DMA_DIRECT_REMAP
 	dma_common_free_remap(addr, pool_size);
-#endif
-free_page: __maybe_unused
+free_page:
 	__free_pages(page, order);
+#endif
 out:
 	return ret;
 }