ASoC: msm: Reset the stream open flag after CMD_CLOSE is sent to DSP

In case of gapless playback, driver does not wait for EOS. CMD_CLOSE
for stream one or two can be called from compress driver free before
EOS ACK for stream one is received. This can result in CMD_CLOSE to
be sent for already closed stream. Reset the stream open flag after
CMD_CLOSE is sent to DSP to prevent multiple CMD_CLOSE on same
stream.

Change-Id: Ic186ae37a760a2996ebd7b9b5dc5d5846621ab66
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>
ASoC: msm: Add check for NULL pointer and buffer overflow

Changes to add check for NULL pointer before they
get dereferenced and check for buffer overflows
to ensure out of bound indexes of arrays are not
accessed.

CRs-fixed: 628847 628850
Change-Id: I3fcebe07a7f9e7ff480857480fa0df2ada017c69
Signed-off-by: Aravind Kumar <akumark@codeaurora.org>