pcm: hw: remove superfluous code to call of SNDRV_PCM_IOCTL_SYNC_PTR in snd_pcm_hw_fo...

pcm: hw: remove superfluous code to call of SNDRV_PCM_IOCTL_SYNC_PTR in snd_pcm_hw_forward()

SNDRV_PCM_IOCTL_SYNC_PTR command was introduced to PCM protocol/interface
in its version 2.0.7, however this command is used in a branch for the
newer version protocol/interface in snd_pcm_hw_forward().

This commit removes the superfluous code as a part of work for code
refactoring.

Fixes: eafb4925124b ("- added SYNC_PTR ioctl support for pcm_hw plugin")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>