tests/test-verify.out

parsers.c: fix integer overflows

thanks to zzuf for helping finding those

% prepare repo
adding FOO.txt
adding QUICK.txt
adding bar.txt

% verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
3 files, 1 changesets, 3 total revisions

% introduce some bugs in repo

% verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
 ?: cannot decode filename 'data/X_f_o_o.txt.i'
 data/FOO.txt.i@0: missing revlog!
 0: empty or missing FOO.txt
 FOO.txt@0: f62022d3d590 in manifests not found
 data/QUICK.txt.i@0: missing revlog!
 0: empty or missing QUICK.txt
 QUICK.txt@0: 88b857db8eba in manifests not found
 data/bar.txt.i@0: missing revlog!
 0: empty or missing bar.txt
 bar.txt@0: 256559129457 in manifests not found
warning: orphan revlog 'data/xbar.txt.i'
3 files, 1 changesets, 0 total revisions
1 warnings encountered!
10 integrity errors encountered!
(first damaged changeset appears to be 0)