bash completion: Don't offer "a.." as a completion for "a."

If the user is trying to complete "v1.5.3.<tab>" to see all of
the available maintenance releases for 1.5.3 we should not give
them an extra dot as the completion.  Instead if the user wants
a ".." or a "..." operator they should key the two dots out on
their own.  Its the same number of keystrokes either way.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -324,9 +324,6 @@ __git_complete_revlist ()
 		cur="${cur#*..}"
 		__gitcomp "$(__git_refs)" "$pfx" "$cur"
 		;;
-	*.)
-		__gitcomp "$cur."
-		;;
 	*)
 		__gitcomp "$(__git_refs)"
 		;;