Decrease speeds when a decrease delta exists

Each time the decrease timer expires, only calculate and request a
decrease in speed when the decrease speed delta does not equal 0.

Tested:
    Decreases no longer requested where the delta == 0

Change-Id: Icbb3ead416d03cd5ebdb11107e0cd6b815802c2f
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
1 file changed