Thread safety fixes.

*** 46,56 ****
          "no"            /* nostr */
  };
  
  struct locdata __posix_messages_locdata = {
          .l_lname = "C",
-         .l_refcnt = (uint32_t)-1,
          .l_data = { &lc_messages_posix }
  };
  
  struct locdata *
  __lc_messages_load(const char *name)
--- 46,55 ----
*** 66,76 ****
          ret = __part_load_locale(name, (char **)&ldata->l_data[1],
              "LC_MESSAGES", LCMESSAGES_SIZE_FULL, LCMESSAGES_SIZE_MIN,
              (const char **)lmsgs);
  
          if (ret != _LDP_LOADED) {
!                 __locdata_release(ldata);
                  errno = EINVAL;
                  return (NULL);
          }
  
          if (lmsgs->yesstr == NULL)
--- 65,75 ----
          ret = __part_load_locale(name, (char **)&ldata->l_data[1],
              "LC_MESSAGES", LCMESSAGES_SIZE_FULL, LCMESSAGES_SIZE_MIN,
              (const char **)lmsgs);
  
          if (ret != _LDP_LOADED) {
!                 __locdata_free(ldata);
                  errno = EINVAL;
                  return (NULL);
          }
  
          if (lmsgs->yesstr == NULL)