storageutil: convert fileid to bytes to avoid cast to %s

test-storage.py manages to trigger this on Python 3.

Differential Revision: https://phab.mercurial-scm.org/D5117

mercurial/utils/storageutil.py

@@ -182,7 +182,8 b' def fileidlookup(store, fileid, identifi'
         try:
             return store.node(fileid)
         except IndexError:
-            raise error.LookupError(fileid, identifier, _('no match found'))
+            raise error.LookupError('%d' % fileid, identifier,
+                                    _('no match found'))
 
     if len(fileid) == 20:
         try: