info: fix ULTs stacks dump works only once

1/one returned value must be tested instead of 0 to
detect that last "parked" XStream is done in
ABTI_info_check_print_all_thread_stacks() and thus
that print_stack_flag can be reset to PRINT_STACK_FLAG_UNSET
to allow for a next dump to be started.

DAOS-14248 ticket, Argobots issue pmodels#393.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>

src/info.c

@@ -1097,7 +1097,8 @@ void ABTI_info_check_print_all_thread_stacks(void)
 
  /* Decrement the barrier value. */
  int dec_value = ABTD_atomic_fetch_sub_int(&print_stack_barrier, 1);
- if (dec_value == 0) {
+ /* previous value should be 1 ! */
+ if (dec_value == 1) {
  /* The last execution stream resets the flag. */
  ABTD_atomic_release_store_int(&print_stack_flag,
  PRINT_STACK_FLAG_UNSET);