synthrepo: close progress topics

Differential Revision: https://phab.mercurial-scm.org/D3810

contrib/synthrepo.py

@@ -219,6 +219,7 b' def analyze(ui, repo, *revs, **opts):'
             filesadded[fileadds] += 1
             dirsadded[diradds] += 1
             filesremoved[fileremoves] += 1
+        progress.complete()
 
     invchildren = zerodict()
 
@@ -483,6 +484,7 b' def synthesize(ui, repo, descpath, **opt'
         heads.add(repo.changelog.rev(newnode))
         heads.discard(r1)
         heads.discard(r2)
+    progress.complete()
 
     lock.release()
     wlock.release()