Fix possible NPE when starting a transport fails before startAsync() returns.

transportFailedOrStopped() sets activeTransport to null, but
obtainActiveTransport expected it to be non-null because it just set it.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=74264310
1 file changed
tree: eb18d936709b30409b444b7017a7de3bbfbb5978
  1. auth/
  2. core/
  3. stub/
  4. testing/
  5. LICENSE