When DPM is updated while lock screen is inhibited, don't
unconditionally enable lock screen.

Change-Id: Iab2af06eb8e41fbcfc6adfbeb5b42a9bbf446fe9
DO NOT MERGE - Fix improper declaration/use of pointer.

https://code.google.com/p/android/issues/detail?id=61547

This variable is shadowing the outer "ptr" declaration, resulting in a
potential NULL pointer being passed to the message API.

Change-Id: If96bfae8d5e874e12597182678a180ba137b78da