Simplify a few binary checks for bit 1

Simplify a few binary checks for bit 1

( $var & 1 ) is either 0 or 1, which can be used as a boolean value.
The main advantage of this is that there is no confusion with the
operator precedence. In `$var & 1 !== 1` the `!==` is executed first,
effectively turning it into `$var & 0`. This always succeeds.

Change-Id: I53c81a3891d42b2660eefc311f1f0f2523104894