unpack-trees: avoid nuking untracked dir in way of locally deleted file

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

t/t2500-untracked-overwriting.sh

@@ -218,7 +218,7 @@ test_expect_success 'git am --abort and untracked dir vs. unmerged file' '
 	)
 '
 
-test_expect_failure 'git am --skip and untracked dir vs deleted file' '
+test_expect_success 'git am --skip and untracked dir vs deleted file' '
 	test_setup_sequencing am_skip_and_untracked &&
 	(
 		cd sequencing_am_skip_and_untracked &&

unpack-trees.c

@@ -2409,7 +2409,10 @@ static int deleted_entry(const struct cache_entry *ce,
 		if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o))
 			return -1;
 		return 0;
+	} else if (verify_absent_if_directory(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) {
+		return -1;
 	}
+
 	if (!(old->ce_flags & CE_CONFLICTED) && verify_uptodate(old, o))
 		return -1;
 	add_entry(o, ce, CE_REMOVE, 0);