contrib: fix typo

contrib: fix typo

I forgot to fix it in flight, this commit will do fine.

--- a/contrib/dumprevlog	Mon May 03 12:27:09 2021 +0200
+++ b/contrib/dumprevlog	Wed May 12 10:24:17 2021 +0200
@@ -39,7 +39,7 @@
     localf = encoding.strtolocal(f)
     if not localf.endswith(b'.i'):
         print("file:", f, file=sys.stderr)
-        print("  invalida filename", file=sys.stderr)
+        print("  invalid filename", file=sys.stderr)
 
     r = revlog.revlog(
         binopen,