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use NULL getmemid segop as a shorthand for ENODEV
Instead of forcing every segment driver to implement a dummy function to
return (hopefully) ENODEV, handle NULL getmemid segop function pointer as
"return ENODEV" shorthand.
*** 128,138 ****
          .getoffset      = nop,
          .gettype        = nop,
          .getvp          = nop,
          .advise         = nop,
          .setpagesize    = nop,
-         .getmemid       = nop,
          .getpolicy      = nop,
  #endif
  };
  
  /*
--- 128,137 ----