test-dumprevlog: fix extra path separator under MacOSX

The "find .hg/store/ -name '*.i'" command returned paths with extra separators
like '.hg/store//00changelog.i'.

tests/test-dumprevlog

@@ -23,7 +23,7 python $CONTRIBDIR/dumprevlog .hg/store/
 echo dumprevlog done
 
 # dump all revlogs to file repo.dump
-find .hg/store/ -name "*.i" | xargs python $CONTRIBDIR/dumprevlog > ../repo.dump
+find .hg/store -name "*.i" | xargs python $CONTRIBDIR/dumprevlog > ../repo.dump
 
 cd ..