reiserfs: use sb_bdev_nr_blocks

Use the sb_bdev_nr_blocks helper instead of open coding it.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Reviewed-by: Jan Kara <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jens Axboe <[e-mail]>

fs/reiserfs/super.c

···
 
 			if (!strcmp(arg, "auto")) {
 				/* From JFS code, to auto-get the size. */
-				*blocks =
-				    i_size_read(s->s_bdev->bd_inode) >> s->
-				    s_blocksize_bits;
+				*blocks = sb_bdev_nr_blocks(s);
 			} else {
 				*blocks = simple_strtoul(arg, &p, 0);
 				if (*p != '\0') {