grep: Fix two memory leaks
grep: Fix two memory leaks

We duplicate the grep_opt structure when using grep threads, but didn't
later free either the patterns attached to this new structure or the
structure itself.

Signed-off-by: Dan McGee <a6e5737275ff1276377ee261739f3ee963671241@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git