dm integrity: fix out-of-range warning

Depending on the value of CONFIG_HZ, clang complains about a pointless
comparison:

drivers/md/dm-integrity.c:4085:12: error: result of comparison of
                        constant 42949672950 with expression of type
                        'unsigned int' is always false
                        [-Werror,-Wtautological-constant-out-of-range-compare]
                        if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {

As the check remains useful for other configurations, shut up the
warning by adding a second type cast to uint64_t.

Fixes: 468dfca3 ("dm integrity: add a bitmap mode")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-integrity.c

@@ -4221,7 +4221,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned int argc, char **argv
 		} else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
 			log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
 		} else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
-			if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
+			if ((uint64_t)val >= (uint64_t)UINT_MAX * 1000 / HZ) {
 				r = -EINVAL;
 				ti->error = "Invalid bitmap_flush_interval argument";
 				goto bad;