md: Fix static checker warning in analyze_sbs

The following warn is reported:

drivers/md/md.c:3912 analyze_sbs()
warn: iterator 'i' not incremented

Fixes: d8730f0cf4ef ("md: Remove deprecated CONFIG_MD_MULTIPATH")
Reported-by: Dan Carpenter <[e-mail]>
Closes: https://lore.kernel.org/linux-raid/[e-mail]/T/#t
Signed-off-by: Li Nan <[e-mail]>
Link: https://lore.kernel.org/linux-raid/[e-mail]
Signed-off-by: Yu Kuai <[e-mail]>

drivers/md/md.c

···
 
 static int analyze_sbs(struct mddev *mddev)
 {
-	int i;
 	struct md_rdev *rdev, *freshest, *tmp;
 
 	freshest = NULL;
···
 	super_types[mddev->major_version].
 		validate_super(mddev, NULL/*freshest*/, freshest);
 
-	i = 0;
 	rdev_for_each_safe(rdev, tmp, mddev) {
 		if (mddev->max_disks &&
-		    (rdev->desc_nr >= mddev->max_disks ||
-		     i > mddev->max_disks)) {
+		    rdev->desc_nr >= mddev->max_disks) {
 			pr_warn("md: %s: %pg: only %d devices permitted\n",
 				mdname(mddev), rdev->bdev,
 				mddev->max_disks);