Ext2: remove the overhead check about sb in the function ext2_new_blocks
It can be guranteed that inode->i_sb should not be null in vfs. So here the check about it is overhead. Signed-off-by: NWang Shilong <wangsl-fnst@cn.fujitsu.com> Signed-off-by: NJan Kara <jack@suse.cz>
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