Make host ashmem_create_region seed only once.

Not seeding this each call should help reduce collisions when multiple
threads are calling ashmem_create_region. Also cleaned up code by
deleting gotos, and making formatting consistent.

Bug: 15394258

(cherry picked from commit 1104ae8cfc0e5144e7d796cf29ee124d05401cbf)

Change-Id: Iafdaea57b2317e0eb7c40d7b5595c523814fd88c
2 files changed