snmpd(8): fix trapv2 on correct protocol detection

[Martijn van Duren]

This type-O snuck in when merging traphandler into snmpe.
Not a big deal since it's there just for ASN1/SMI strictness, but it
breaks when introducing SNMPv3 support.

OK?

martijn@

Index: snmpe.c
===================================================================
RCS file: /cvs/src/usr.sbin/snmpd/snmpe.c,v
retrieving revision 1.72
diff -u -p -r1.72 snmpe.c
--- snmpe.c     20 Jun 2021 19:55:48 -0000      1.72
+++ snmpe.c     22 Jul 2021 20:31:31 -0000
@@ -381,7 +381,7 @@ badversion:
        case SNMP_C_TRAPV2:
                if (msg->sm_pdutype == SNMP_C_TRAPV2 &&
                    !(msg->sm_version == SNMP_V2 ||
-                   msg->sm_version != SNMP_V3)) {
+                   msg->sm_version == SNMP_V3)) {
                        msg->sm_errstr = "trapv2 request on !SNMPv2C or "
                            "!SNMPv3 message";
                        goto parsefail;