git-bisect: fix wrong usage of read(1)
git-bisect: fix wrong usage of read(1)

Signed-off-by:  Francis Moreau <e4447d4474ddf777c273f7db328088c83a9f6d32@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