bitbake: siggen: Fix hashequiv bug where new hash wasn't referenced correctly

If a hash is reported to the hash server, the stamp written out by the
current task didn't account for any new hash the server may have provided.
Fix this so the correct stamp is written. This means "bitbake X; bitbake X"
no longer rebuilds lots of things when hashequiv is active.

(Bitbake rev: 9dc5178f56ab8ae37e1a646c09117c503e48d072)

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

bitbake/lib/bb/siggen.py

@@ -508,6 +508,7 @@ class SignatureGeneratorUniHashMixIn(object):
                 if new_unihash != unihash:
                     bb.debug(1, 'Task %s unihash changed %s -> %s by server %s' % (taskhash, unihash, new_unihash, self.server))
                     bb.event.fire(bb.runqueue.taskUniHashUpdate(fn + ':do_' + task, new_unihash), d)
+                    self.set_unihash(tid, new_unihash)
                 else:
                     bb.debug(1, 'Reported task %s as unihash %s to %s' % (taskhash, unihash, self.server))
             except hashserv.client.HashConnectionError as e: