[PATCH] erofs: clean up z_erofs_pcluster_readmore()

[Gao Xiang]

On 2023/5/25 00:26, Yue Hu wrote:
> From: Yue Hu <huyue2 at coolpad.com>
> 
> No need end parameter since it's pointless for !backmost, we can get it
> for backmost internally.  And we only expand the trailing edge, so the
> newstart can be replaced with ->headoffset.
> 
> Also, remove linux/prefetch.h that is not used anymore after commit
> 386292919c25 ("erofs: introduce readmore decompression strategy").
> 
> Signed-off-by: Yue Hu <huyue2 at coolpad.com>

Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Will test it with the following bulk later.

Thanks,
Gao Xiang