block: remove redundant kill_bdev() call in set_blocksize()

The second kill_bdev() call in set_blocksize() is redundant as the first
call already clears all buffers and pagecache, and locks prevent new
pagecache creation between the calls.

Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: Yang Xiuwei

block/bdev.c

@@ -208,7 +208,6 @@ int set_blocksize(struct file *file, int size)
 
 		inode->i_blkbits = blksize_bits(size);
 		mapping_set_folio_min_order(inode->i_mapping, get_order(size));
-		kill_bdev(bdev);
 		filemap_invalidate_unlock(inode->i_mapping);
 		inode_unlock(inode);
 	}