UPSTREAM: erofs: avoid useless loops in z_erofs_pcluster_readmore() when reading beyond EOF

z_erofs_pcluster_readmore() may take a long time to loop when the page
offset is large enough, which is unnecessary should be prevented.

For example, when the following case is encountered, it will loop 4691368
times, taking about 27 seconds:
    - offset = 19217289215
    - inode_size = 1442672

Signed-off-by: Chunhai Guo <guochunhai@vivo.com>
Fixes: 38629291 ("erofs: introduce readmore decompression strategy")
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230710042531.28761-1-guochunhai@vivo.com


Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
(cherry picked from commit 936aa701
    https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git

 dev)
Bug: 296824280
Bug: 301017317
Bug: 301378679

Change-Id: I279b0fadcfa8c0ff0d638a86c7bb2c6b4d07f194
Signed-off-by: sunshijie <sunshijie@xiaomi.corp-partner.google.com>
Signed-off-by: sunshijie <sunshijie@xiaomi.com>