mm: zswap: use ATOMIC_LONG_INIT to initialize zswap_stored_pages

This is currently the only atomic_long_t variable initialized by
ATOMIC_INIT macro found in the kernel by using `grep -r atomic_long_t |
grep ATOMIC_INIT`

This was introduced in 6e1fa55, in which we modified the type of
zswap_stored_pages to atomic_long_t, but didn't change the initialization.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 6e1fa55 ("mm: zswap: modify zswap_stored_pages to be atomic_long_t")
Signed-off-by: Sun YangKai <[email protected]>
Acked-by: Yosry Ahmed <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Chengming Zhou <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kanchana P Sridhar <[email protected]>
Cc: Nhat Pham <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Sun YangKai

mm/zswap.c

@@ -43,7 +43,7 @@
 * statistics
 **********************************/
 /* The number of compressed pages currently stored in zswap */
-atomic_long_t zswap_stored_pages = ATOMIC_INIT(0);
+atomic_long_t zswap_stored_pages = ATOMIC_LONG_INIT(0);
 
 /*
  * The statistics below are not protected from concurrent access for