build: fix uninitialized-use when build with prebuilt toolchain [1/1]

build: fix uninitialized-use when build with prebuilt toolchain [1/1]

PD#SWPL-8241

Problem:
**SYNC from GOOGLE**
Build failed due to uninitialzed variable

Solution:
Init to reasonable value

Verify:
Build with Android prebuilt toolchain

Change-Id: Ieb8cd73d357c64dd3629079fc9a2a86c60717ebf
Reviewed-on: https://eureka-partner-review.googlesource.com/c/amlogic/media_modules/+/132909
Tested-by: Ben Cheng <bccheng@google.com>
Reviewed-by: Ben Cheng <bccheng@google.com>
Commit-Queue: Ben Cheng <bccheng@google.com>