Fix two lint warnings in IMMS

This is a follow up to my previous CL [1].

There must be no observable behavior change.

 [1]: I9d4615e6da979204c21555e040a687163c1460ab
      e08e5c4a

Bug: 349904272
Test: presubmit
Flag: EXEMPT refactor
Change-Id: Ic329263f16077c954e0b7075154db37ca221c61d