tree-walk.c: ignore trailing slash on submodule in tree_entry_interesting()

We do ignore trailing slash on a directory, so pathspec "abc/" matches
directory "abc". A submodule is also a directory. Apply the same logic
to it. This makes "git log submodule-path" and "git log submodule-path/"
produce the same output.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/tree-walk.c b/tree-walk.c
index 680afda..c29b6a3 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -543,7 +543,7 @@
 	if (matchlen > pathlen) {
 		if (match[pathlen] != '/')
 			return 0;
-		if (!S_ISDIR(entry->mode))
+		if (!S_ISDIR(entry->mode) && !S_ISGITLINK(entry->mode))
 			return 0;
 	}