merge-recursive: remove duplicate code

In commit 51931bf (merge-recursive: Improve handling of rename
target vs. directory addition, 2011-08-11), I apparently added two
lines of code that were immediately duplicated a few lines later.
No idea why, other than it seems pretty clear this was a mistake:
there is no need to remove the same file twice; removing it once is
sufficient...especially since the intervening line was working with
a different file entirely.

Signed-off-by: Elijah Newren <newren@gmail.com>
Reviewed-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

merge-recursive.c

@@ -1773,8 +1773,6 @@ static int process_entry(struct merge_options *o,
 			output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
 			       "Adding %s as %s"),
 			       conf, path, other_branch, path, new_path);
-			if (o->call_depth)
-				remove_file_from_cache(path);
 			update_file(o, 0, sha, mode, new_path);
 			if (o->call_depth)
 				remove_file_from_cache(path);