mm: zswap: remove unnecessary check in zswap_find_zpool()

zswap_find_zpool() checks if ZSWAP_NR_ZPOOLS > 1, which is always true.
This is a remnant from a patch version that had ZSWAP_NR_ZPOOLS as a
config option and never made it upstream. Remove the unnecessary check.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Yosry Ahmed <[e-mail]>
Reviewed-by: Chengming Zhou <[e-mail]>
Reviewed-by: Nhat Pham <[e-mail]>
Acked-by: Johannes Weiner <[e-mail]>
Cc: Yosry Ahmed <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/zswap.c

···
 
 static struct zpool *zswap_find_zpool(struct zswap_entry *entry)
 {
-	int i = 0;
-
-	if (ZSWAP_NR_ZPOOLS > 1)
-		i = hash_ptr(entry, ilog2(ZSWAP_NR_ZPOOLS));
-
-	return entry->pool->zpools[i];
+	return entry->pool->zpools[hash_ptr(entry, ilog2(ZSWAP_NR_ZPOOLS))];
 }
 
 /*