erofs: use wrapper i_blocksize() in erofs_file_read_iter()

linux/fs.h has a wrapper for this operation.
Signed-off-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230306075527.1338-1-zbestahu@gmail.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/data.c

@@ -376,7 +376,7 @@ static ssize_t erofs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 		if (bdev)
 			blksize_mask = bdev_logical_block_size(bdev) - 1;
 		else
-			blksize_mask = (1 << inode->i_blkbits) - 1;
+			blksize_mask = i_blocksize(inode) - 1;
 
 		if ((iocb->ki_pos | iov_iter_count(to) |
 		     iov_iter_alignment(to)) & blksize_mask)