copyleft_compliance: handle localpaths ending with '/'

(From OE-Core rev: 1f30d2eb2ef45550c71969c735275db1448b6ac6)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/copyleft_compliance.bbclass

@@ -39,6 +39,8 @@ python do_prepare_copyleft_sources () {
         local = os.path.normpath(fetch.localpath(u.url))
         if local.endswith('.bb'):
             continue
+        elif local.endswith('/'):
+            local = local[:-1]
 
         if u.mirrortarball:
             tarball_path = os.path.join(dl_dir, u.mirrortarball)