[sheepdog] [sheepdog/sheepdog] 58d6fc: isa-l: remove build warning

[Hitoshi Mitake]

  Branch: refs/heads/isa-build-warning
  Home:   https://github.com/sheepdog/sheepdog
  Commit: 58d6fc21bd7194f1e7145dae5ad73c45f89ee103
      https://github.com/sheepdog/sheepdog/commit/58d6fc21bd7194f1e7145dae5ad73c45f89ee103
  Author: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
  Date:   2015-08-30 (Sun, 30 Aug 2015)

  Changed paths:
    M include/fec.h

  Log Message:
  -----------
  isa-l: remove build warning

This commit removes build warnings like below:

  CC       net.o
In file included from ../include/internal_proto.h:25:0,
           from ../include/sheep.h:16,
           from net.c:31:
../include/fec.h: In function ‘ec_encode’:
../include/fec.h:175:6: warning: variable ‘pidx’ set but not used [-Wunused-but-set-variable]
  int pidx[p];

Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>