Fix off-by-one bug in tor22-scan-converter.

This makes the implementation in tor22-scan-converter match the one in
tor-scan-converter.
1 job for master in 5 minutes and 47 seconds (queued for 28 seconds)
Status Job ID Name Coverage
  Test
failed #292439
fedora:test

00:05:47

 
Name Stage Failure
failed
fedora:test Test
make[1]: *** [Makefile:906: check-recursive] Error 1
make[1]: Leaving directory '/builds/cairo/cairo'
make: *** [Makefile:1358: check] Error 2
Uploading artifacts...
test/*.log: found 2 matching files
test/pdiff/*.log: found 1 matching files

test/output: found 2224 matching files

Uploading artifacts to coordinator... ok
id=292439 responseStatus=201 Created token=6Ke_2B5S
ERROR: Job failed: exit code 1