media utils: fix UAF in TimeCheckThread

Read log tag from request list under lock
to avoid use after free.

Bug: 142142406
Test: make
Change-Id: If4adab8c15a319dc84b7003adf3ac59a3980f075
Merged-In: If4adab8c15a319dc84b7003adf3ac59a3980f075
(cherry picked from commit 9b9b3de144ce3a145b01a01424b706f69c6d7ed6)
1 file changed