bash completion: remove unused function _git_diff_tree

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 30d870187e64e33ed430dc1fab1ea37036a07f58..e32c1f1a9ccd26132f4bf7e42905ac5ce16a67a2 100755 (executable)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -721,11 +721,6 @@ _git_diff ()
        __git_complete_file
 }
 
-_git_diff_tree ()
-{
-       __gitcomp "$(__git_refs)"
-}
-
 _git_fetch ()
 {
        local cur="${COMP_WORDS[COMP_CWORD]}"