Slight optimization in RunLengthEncoder compare
Slight optimization in RunLengthEncoder compare

Testing if the arguments are falsy on every call is expensive enough to
show up in the benchmarks.

Signed-off-by: Cory Snider <87b0801b5ae89138bc6ef7008a1f460a1bee8994@fitbit.com>

Fitbit/image-codec-txi,Fitbit/image-codec-txi