libvideorender: CB2 fix buffer exception release [1/1]

PD#SWPL-181759

Problem:
Timing error causes buffer to be unusually reused

Solution:
add a mutex.

Verify:
ap222

Change-Id: Ice7478330cb08978b476436a1265eb36f326c259
Signed-off-by: fei.deng <fei.deng@amlogic.com>
1 file changed