Convert variable assignment to happen inside an if
Convert variable assignment to happen inside an if

Really a no-op, but assigns the `job` variable once, based on the logic
flow inside the following `if` block.

See https://github.com/bbatsov/ruby-style-guide#use-if-case-returns for
other examples.

miketheman/lita-jenkins,tuxmea/lita-jenkins,daniely/lita-jenkins