Merge "offload.c - make tether_error_map read only." am: 17783974ef

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2261966

Change-Id: I2318d364ae3ede2571154e6f315f1b86514ce95a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>