Use internal release function in oid_ops.c

In the end the internal one is called in all cases, but it seem
cleaner to use the internal one instead of relying on the redirection.

src/lib/gssapi/generic/oid_ops.c

@@ -542,7 +542,7 @@ generic_gss_copy_oid_set(OM_uint32 *minor_status,
     *new_oidset = copy;
 done:
     if (major != GSS_S_COMPLETE) {
-        (void) gss_release_oid_set(&minor, &copy);
+        (void) generic_gss_release_oid_set(&minor, &copy);
     }
 
     return (major);