gssapi: remove dead code

Remove assignment of a variable to itself.

Identified by AppChecker.

Change-Id: I94012849d8200dc91394a8548e72c61404d7e5b6

lib/gssapi/test_context.c

@@ -126,7 +126,6 @@ string_to_oids(gss_OID_set *oidsetp, gss_OID_set oidset,
                 errx(1, "too many mech names given");
             oidset->elements[oidset->count] = *string_to_oid(name);
         }
-        oidset->count = oidset->count;
     }
     *oidsetp = oidset;
 }