10076 make usr/src/test smatch clean

*** 66,76 ****
          }
  
          if (rc == 0) {
                  done = 1;
                  ucp.uc_mcontext.gregs[seg] = selector;
!                 setcontext(&ucp);
          }
          abort();
  }
  
  static void
--- 66,76 ----
          }
  
          if (rc == 0) {
                  done = 1;
                  ucp.uc_mcontext.gregs[seg] = selector;
!                 (void) setcontext(&ucp);
          }
          abort();
  }
  
  static void