dm: change kzalloc to kcalloc

Use 2-factor multiplication argument form kcalloc() instead
of instead of the deprecated kzalloc() [1].

[1] https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
Link: https://github.com/KSPP/linux/issues/162

Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

drivers/md/dm-ps-io-affinity.c

@@ -116,7 +116,7 @@ static int ioa_create(struct path_selector *ps, unsigned int argc, char **argv)
 	if (!s)
 		return -ENOMEM;
 
-	s->path_map = kzalloc(nr_cpu_ids * sizeof(struct path_info *),
+	s->path_map = kcalloc(nr_cpu_ids, sizeof(struct path_info *),
 			      GFP_KERNEL);
 	if (!s->path_map)
 		goto free_selector;