Fix kernel compilation warnings.

Resolve compilation warnings encountered when building with the most
recent platform version of gcc 4.9:

  .../hardware/bsp/kernel/intel/edison-3.10/sound/soc/intel/effects.c:191:31: error: 'pipe_id' may be used uninitialized in this function [-Werror=maybe-uninitialized]
    dsp_payload->dsp_hdr.pipe_id = pipe_id;
                               ^
  .../hardware/bsp/kernel/intel/edison-3.10/sound/soc/intel/effects.c:227:5: note: 'pipe_id' was declared here
    u8 pipe_id;

Bug: 26226110
Change-Id: I587a9f03af1067a4a7984dc432acc47754e845cf
1 file changed