10141 smatch fix for zoneadmd

*** 2272,2286 ****
          for (;;)
                  (void) pause();
  
  child_out:
          assert(pid == 0);
!         if (shstate != NULL) {
                  shstate->status = -1;
                  (void) sema_post(&shstate->sem);
                  (void) munmap((char *)shstate, shstatelen);
-         }
  
          /*
           * This might trigger an unref notification, but if so,
           * we are still holding the lock, so our call to exit will
           * ultimately win the race and will publish the right exit
--- 2272,2285 ----
          for (;;)
                  (void) pause();
  
  child_out:
          assert(pid == 0);
! 
          shstate->status = -1;
          (void) sema_post(&shstate->sem);
          (void) munmap((char *)shstate, shstatelen);
  
          /*
           * This might trigger an unref notification, but if so,
           * we are still holding the lock, so our call to exit will
           * ultimately win the race and will publish the right exit