#1279 snmpd coredumps in logmatch.c::logmatch_free_config on Solaris

[gmr]

On Solaris, whenever there is a wrong regex as logmatch parameter, when the corresponding structures are being de-allocated, snmpd coredumps.

This is because we are freeing the structures using regfree(), even when the corresponding regcomp() returns with an error. The attached patch fixes the issue.

[Niels Baggesen]

Thanks for the patch! A slightly modified version has been applied to Net-SNMP.