#10 ".0" is not needed for snmpwalk

[Evgenii Terechkov]

Appending of ".0" to OID (on clicking in MIB tree) dont work with external "snmpwalk":

evg@thinkpad ~ $snmpwalk -m "" -v2c -c public -t 2 -r 2 192.168.192.3:161 .1.3.6.1.2.1.2.2.1.10.0
iso.3.6.1.2.1.2.2.1.10.0 = No Such Instance currently exists at this OID
evg@thinkpad ~ $snmpwalk -m "" -v2c -c public -t 2 -r 2 192.168.192.3:161 .1.3.6.1.2.1.2.2.1.10
iso.3.6.1.2.1.2.2.1.10.1 = Counter32: 1648650519
iso.3.6.1.2.1.2.2.1.10.2 = Counter32: 1024887425
iso.3.6.1.2.1.2.2.1.10.3 = Counter32: 0
evg@thinkpad ~ $snmpwalk --version
NET-SNMP version: 5.7.2

Attaching patch that works fine to me.