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This was pointed out by another compiler warning. The 'name' parameter of inquire_cred_by_mech is not a gss_name_t (which is the type of GSS_C_NO_NAME); it's a gss_name_t *, because it's an _output_ parameter. We're not telling the library that we aren't _passing_ a name: we're telling it that we don't need it to _return_ us a name. So the appropriate null pointer representation is just NULL. (This was harmless apart from a compiler warning, because gss_name_t is a pointer type in turn and GSS_C_NO_NAME expands to a null pointer anyway. It was just a wrongly-typed null pointer.)