[collectd] snmp plugin gets collectd killed for segfault

[adnane]

hello list!

the pluging gets collectd killed for segfault when it encounter a non 
responding device

[2014-11-13 15:55:01] snmp plugin: host esomehost: 
snmp_sess_synch_response failed: Timeout

Nov 13 15:55:01 machine kernel: collectd[41452]: segfault at 18 ip 
000000363b075fb3 sp 00007f4cb1602580 error 4 in 
libc-2.12.so[363b000000+18a000]

NB: collectd compiled from master branch.

tnx