phabricator: remove *-argument from _getdrevs()

It can't take more than one specs arguments per len(*specs).

hgext/phabricator.py

@@ -1632,19 +1632,19 b' def getdiffmeta(diff):'
     return meta
 
 
-def _getdrevs(ui, stack, *specs):
+def _getdrevs(ui, stack, specs):
     """convert user supplied DREVSPECs into "Differential Revision" dicts
 
     See ``hg help phabread`` for how to specify each DREVSPEC.
     """
-    if len(*specs) > 0:
+    if len(specs) > 0:
 
         def _formatspec(s):
             if stack:
                 s = b':(%s)' % s
             return b'(%s)' % s
 
-        spec = b'+'.join(pycompat.maplist(_formatspec, *specs))
+        spec = b'+'.join(pycompat.maplist(_formatspec, specs))
 
         drevs = querydrev(ui, spec)
         if drevs: