tree 3e23ff52c9d1dbc402987ea708c7b3994ff518f1
parent 71c19fd4078b026dbe1c528c40e670a09893eff2
author John Grossman <johngro@google.com> 1314638807 -0700
committer John Grossman <johngro@google.com> 1314639148 -0700

Add a missing NULL check.

The get_next_write_timestamp method introduced to the audio HAL is optional.
HALs which do not implement it leave it set to NULL.  Callers (there is
currently only one in the AudioMixer code) need to be certain to check for NULL
before invoking it.

Change-Id: I9e06d688311c388446bb53993291ebc0f98cff89