erofs-utils: get rid of `end' argument from erofs_mapbh()

`end` arguement is completely broken now. Also, it could
be reintroduced later if needed.

Link: https://lore.kernel.org/r/20210122171153.27404-2-hsiangkao@aol.com
Signed-off-by: Hu Weiwen <sehuww@mail.scut.edu.cn>
Reviewed-by: Li Guifu <bluce.lee@aliyun.com>
Signed-off-by: Gao Xiang <hsiangkao@aol.com>
6 files changed