bitbake: utils: Tweak lock_timeout logic

We should really try and take the lock in the try/finally block so that
in some rare cases such as badly timed interrupt/signal, we always release
the lock.

(Bitbake rev: a9eb8bf7174b6962b5ba07192fe95b8c7112d9d2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/utils.py

@@ -1881,8 +1881,8 @@ def path_is_descendant(descendant, ancestor):
 # we exit at some point than hang. 5 minutes with no progress means we're probably deadlocked.
 @contextmanager
 def lock_timeout(lock):
-    held = lock.acquire(timeout=5*60)
     try:
+        held = lock.acquire(timeout=5*60)
         if not held:
             bb.server.process.serverlog("Couldn't get the lock for 5 mins, timed out, exiting.\n%s" % traceback.format_stack())
             os._exit(1)