git-p4: Fix one-liner in p4_write_pipe function.
git-p4: Fix one-liner in p4_write_pipe function.

The function built a p4 command string via the p4_build_cmd function, but
ignored the result.

Signed-off-by: Tor Arvid Lund <10881b5c954573e37687444135aa1ca5b764260c@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