11414 Fix smatch issue in libdemangle

*** 237,247 ****
                  return (B_FALSE);
          }
  
          rem = sv_remaining(&sv);
  
!         if (rem < len || len > SIZE_MAX) {
                  st->rds_error = EINVAL;
                  return (B_FALSE);
          }
  
          /* Is this the last segment before the terminating E? */
--- 237,247 ----
                  return (B_FALSE);
          }
  
          rem = sv_remaining(&sv);
  
!         if (rem < len || len == SIZE_MAX) {
                  st->rds_error = EINVAL;
                  return (B_FALSE);
          }
  
          /* Is this the last segment before the terminating E? */