msm: vidc: Set instance state to invalid upon error

Change instance state to invalid in case of errors else
state handling will result in other unexcepted errors.

CRs-Fixed: 2135048
Change-Id: I19fdf9070e5b3bd3838b94443b587b39972246ea
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>