NULL pointer write on "bulkget system icmp"

snmp_agent.c:handle_one_var() doesn't check NULL value of return pointer after calling snmp_add_null_var(). On my setup, writes to NULL pointer structure from a "bulkget system icmp" request.

Not sure why snmp_add_null_var() returned NULL (many cases do) or what proper fix is.

It's here:
http://exr.lunn.ch/http/source/packages/net/snmp/agent/current/src/snmp_agent.c#L453

    var_ptr2 = snmp_add_null_var(asp->pdu, var_ptr->name, MAX_OID_LEN);
    for ( i=var_ptr->name_length ; i<MAX_OID_LEN ; i++)
!!!     var_ptr2->name[i] = 0;
!!!    var_ptr2->name_length = var_ptr->name_length;
    allDone = FALSE;

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