md: raid5.c convert simple_strtoul to strict_strtoul

strict_strtoul handles the open-coded sanity checks in
raid5_store_stripe_cache_size and raid5_store_preread_threshold

Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/md/raid5.c

@@ -4041,15 +4041,13 @@ static ssize_t
 raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
 {
 	raid5_conf_t *conf = mddev_to_conf(mddev);
-	char *end;
-	int new;
+	unsigned long new;
 	if (len >= PAGE_SIZE)
 		return -EINVAL;
 	if (!conf)
 		return -ENODEV;
 
-	new = simple_strtoul(page, &end, 10);
-	if (!*page || (*end && *end != '\n') )
+	if (strict_strtoul(page, 10, &new))
 		return -EINVAL;
 	if (new <= 16 || new > 32768)
 		return -EINVAL;
@@ -4087,17 +4085,15 @@ static ssize_t
 raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len)
 {
 	raid5_conf_t *conf = mddev_to_conf(mddev);
-	char *end;
-	int new;
+	unsigned long new;
 	if (len >= PAGE_SIZE)
 		return -EINVAL;
 	if (!conf)
 		return -ENODEV;
 
-	new = simple_strtoul(page, &end, 10);
-	if (!*page || (*end && *end != '\n'))
+	if (strict_strtoul(page, 10, &new))
 		return -EINVAL;
-	if (new > conf->max_nr_stripes || new < 0)
+	if (new > conf->max_nr_stripes)
 		return -EINVAL;
 	conf->bypass_threshold = new;
 	return len;