Staging: android: binder: Fix death notifications

The change (008fa749e0fe5b2fffd20b7fe4891bb80d072c6a) that moved the
node release code to a separate function broke death notifications in
some cases. When it encountered a reference without a death
notification request, it would skip looking at the remaining
references, and therefore fail to send death notifications for them.

Change-Id: I12083a50709ccc30ba11a5f4d9eeb5f0ff4471c6
Signed-off-by: Arve Hjønnevåg <arve@android.com>