ueventd: fix other assorted style nits

Indentation in this file is four spaces, remove an
unnecessary trailing semicolon, put a space between
a type declaration and its structured binding.

clang-format shuffled a line around as well.

Bug: None
Test: compile
Change-Id: Ib4cf17fecb1e54971020dc77b7903d2aac5dd9c1