msm: vidc: Bug fix in instance clean-up

When close is called directly without proper state operations,
then driver tries to clean all V4L2 framework memory. When driver
calls queue_release, it tries to call stream_off again. This
causes driver to re-enter the state operations. This change
prevents driver to re-enter the state diagram.

Change-Id: I6df248792fca78fe743bead311fa1cec61a6bb79
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>