Merge "codec2: BufferPoolClient: fix NPE in fetchBufferHandle if connection is null" into main am: 43147f43cf

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3222208

Change-Id: I44fcc7ab8a7ba9d62f6c120725ccafc445ccc447
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>