bug#17617: bug / regression in grep-2.19

[Norihiro Tanaka]

Thanks for the report.  I submit a patch to fix and test it.

When `is' of `must' is cleared, should be also cleared `begline' and
`endline' at OR in dfamust.

0001-dfa-fix-bug-mishandled-for-a-pattern-of-multiple-beg.patch
Description: Text document