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

Change-Id: Ib6c972afb8d0004b920ce855bc53b37b3ff317fe