staging: erofs: avoid endless loop of invalid lookback distance 0
As reported by erofs-utils fuzzer, Lookback distance should be a positive number, so it should be actually looked back rather than spinning. Fixes: 02827e17 ("staging: erofs: add erofs_map_blocks_iter") Cc: <stable@vger.kernel.org> # 4.19+ Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20190819103426.87579-7-gaoxiang25@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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