ALSA: pcm: Use ERESTARTSYS instead of EINTR in OSS emulation

[ Upstream commit c64ed5dd

 ]

Fix the last standing EINTR in the whole subsystem.  Use more correct
ERESTARTSYS for pending signals.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>