Rewind input stream when mmaped processing fails.
Rewind input stream when mmaped processing fails.

https://github.com/quixdb/squash/issues/84

Signed-off-by: Evan Nemerson <178b62e73cc3fab9e30bf27b2372c9ff92401915@nemerson.com>

jibsen/squash,quixdb/squash,quixdb/squash,quixdb/squash,jibsen/squash,Cloudef/squash,wolut/squash,jibsen/squash,Cloudef/squash,wolut/squash,Cloudef/squash,wolut/squash