erofs-utils: fuse: fix partial decompression for libdeflate

erofs-utils: fuse: fix partial decompression for libdeflate

Actually, libdeflate doesn't support partial decompression; therefore,
fix it by reallocating larger decompression buffers.

Although a better approach would be to obtain the exact decompressed
length instead for libdeflate decompressor, which requires more changes,
a quick fix is needed.

Fixes: 29b9e7140162 ("erofs-utils: fuse,fsck: add DEFLATE algorithm support")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240809105636.3641536-1-hsiangkao@linux.alibaba.com