[automerger] Init gain config to prevent uninit leak. am: ebe0777edc am: 1f39e79a73 am: f57d4e10ef am: 3fc94f3a7f am: e279da4090 am: 7a41b25ce7 am: 3c5a6f0638 am: 8eb9eb44d1

Change-Id: I816c9ce0d669ff507ec5e4efa41c87b79ec4112f