6659 nvlist_free(NULL) is a no-op

*** 353,363 ****
          /* push the bits out on the wire */
  
          status = stmf_ic_transmit(buf, size);
  
  done:
-         if (nvl)
                  nvlist_free(nvl);
  
          if (buf)
                  kmem_free(buf, size);
  
--- 353,362 ----
*** 969,979 ****
  
          default:
                  ASSERT(0);
          }
  
-         if (msg->icm_nvlist)
                  nvlist_free(msg->icm_nvlist);
  
          kmem_free(msg, sizeof (*msg));
  }
  
--- 968,977 ----
*** 1174,1184 ****
  
  done:
          if (!rc)
                  return (nvl);
  
-         if (nvl)
                  nvlist_free(nvl);
  
          return (NULL);
  }
  
--- 1172,1181 ----