tests: fix a copy/paste name duplication in storage.py

Flagged by PyCharm as a redeclared name without usage, because the name matches
the function immediately preceding it.  But since this differs by doing regular
reads instead of raw reads, I assume we still want it.  But I don't see either
function being called anywhere.

Differential Revision: https://phab.mercurial-scm.org/D7769

mercurial/testing/storage.py

@@ -964,7 +964,7 b' class ifiledatatests(basetestcase):'
         with self.assertRaises(error.StorageError):
             f.rawdata(node1)
 
-    def testbadnoderevisionraw(self):
+    def testbadnoderevision(self):
         # Like above except we test read() first to isolate revision caching
         # behavior.
         f = self._makefilefn()