Plug a couple of leaks

tests-clar/stash/drop.c

@@ -146,6 +146,8 @@ void retrieve_top_stash_id(git_oid *out)
 	cl_git_pass(git_reference_name_to_id(out, repo, GIT_REFS_STASH_FILE));
 
 	cl_assert_equal_i(true, git_oid_cmp(out, git_object_id(top_stash)) == 0);
+
+	git_object_free(top_stash);
 }
 
 void test_stash_drop__dropping_the_top_stash_updates_the_stash_reference(void)
@@ -165,4 +167,6 @@ void test_stash_drop__dropping_the_top_stash_updates_the_stash_reference(void)
 	retrieve_top_stash_id(&oid);
 
 	cl_git_pass(git_oid_cmp(&oid, git_object_id(next_top_stash)));
+
+	git_object_free(next_top_stash);
 }