transplant: remove unneeded loop over repo in revset

hgext/transplant.py

@@ -602,11 +602,7 b' def revsettransplanted(repo, subset, x):'
       s = revset.getset(repo, subset, x)
     else:
       s = subset
-    cs = set()
-    for r in xrange(0, len(repo)):
-      if repo[r].extra().get('transplant_source'):
-        cs.add(r)
-    return [r for r in s if r in cs]
+    return [r for r in s if repo[r].extra().get('transplant_source')]
 
 def kwtransplanted(repo, ctx, **args):
     """:transplanted: String. The node identifier of the transplanted