erofs: remove dead code in erofs_fc_parse_param

If an option is unknown to erofs, which means that option is not in
`erofs_fs_parameters`, `fs_parse` will return -ENOPARAM, which makes
`erofs_fc_parse_param` returns earlier.

Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/DB86A4E2BB2BB44E+20250117100635.335963-2-chenlinxuan@uniontech.com


Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>