msm: vidc_3x: Fix in handing SYS_ERROR

When there is a SYS_ERROR the instance object is getting
freed even before notifying the client causing the kernel
NULL pointer dereferece. (When the max number of instances
reached latest instance will be freed)

Change-Id: I5c93401d650228755516e362ceb8c16a356f2653
Signed-off-by: Mahesh Voorugonda <mvooru@codeaurora.org>