selftests/bpf: disable program test run for progs/refcounted_kptr.c

Florian Westphal found a bug in test_loader.c processing of __retval
tag. Because of this bug the function test_loader.c:do_prog_test_run()
never executed and all __retval test tags were ignored. This hid an
issue with progs/refcounted_kptr.c tests.

When __retval tag bug is fixed and refcounted_kptr.c tests are run
kernel reports various issues and eventually hangs. Shortest reproducer
is the following command run a few times:

  $ for i in $(seq 1 4); do (./test_progs --allow=refcounted_kptr &); done

Commenting out __retval tags for these tests until this issue is resolved.

Reported-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/bpf/f4c4aee644425842ee6aa8edf1da68f0a8260e7c.camel@gmail.com/T/
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230420232317.2181776-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/progs/refcounted_kptr.c

@@ -219,7 +219,7 @@ static long __read_from_unstash(int idx)
 #define INSERT_READ_BOTH(rem_tree, rem_list, desc)			\
 SEC("tc")								\
 __description(desc)							\
-__success __retval(579)							\
+__success /* __retval(579) temporarily disabled */			\
 long insert_and_remove_tree_##rem_tree##_list_##rem_list(void *ctx)	\
 {									\
 	long err, tree_data, list_data;					\
@@ -258,7 +258,7 @@ INSERT_READ_BOTH(false, true, "insert_read_both: remove from list");
 #define INSERT_READ_BOTH(rem_tree, rem_list, desc)			\
 SEC("tc")								\
 __description(desc)							\
-__success __retval(579)							\
+__success /* __retval(579) temporarily disabled */			\
 long insert_and_remove_lf_tree_##rem_tree##_list_##rem_list(void *ctx)	\
 {									\
 	long err, tree_data, list_data;					\
@@ -296,7 +296,7 @@ INSERT_READ_BOTH(false, true, "insert_read_both_list_first: remove from list");
 #define INSERT_DOUBLE_READ_AND_DEL(read_fn, read_root, desc)		\
 SEC("tc")								\
 __description(desc)							\
-__success __retval(-1)							\
+__success /* temporarily __retval(-1) disabled */			\
 long insert_double_##read_fn##_and_del_##read_root(void *ctx)		\
 {									\
 	long err, list_data;						\
@@ -329,7 +329,7 @@ INSERT_DOUBLE_READ_AND_DEL(__read_from_list, head, "insert_double_del: 2x read-a
 #define INSERT_STASH_READ(rem_tree, desc)				\
 SEC("tc")								\
 __description(desc)							\
-__success __retval(84)							\
+__success /* __retval(84) temporarily disabled */			\
 long insert_rbtree_and_stash__del_tree_##rem_tree(void *ctx)		\
 {									\
 	long err, tree_data, map_data;					\