Fixed findings

List of Findings

Error: CPPCHECK_WARNING (CWE-570): [#def1]
avahi-0.9.rc1-build/avahi-0.9.rc1/avahi-core/wide-area.c:134: style[unsignedLessThanZero]: Checking if unsigned expression 'l->engine->n_dns_servers' is less than zero.
#  132|       assert(p);
#  133|   
#  134|->     if (l->engine->n_dns_servers <= 0)
#  135|           return -1;
#  136|   

Error: CPPCHECK_WARNING (CWE-570): [#def2]
avahi-0.9.rc1-build/avahi-0.9.rc1/avahi-core/wide-area.c:608: style[knownConditionTrueFalse]: Condition 'e->fd_ipv6>=0' is always false
#  606|           avahi_log_error(__FILE__": Failed to create wide area sockets: %s", strerror(errno));
#  607|   
#  608|->         if (e->fd_ipv6 >= 0)
#  609|               close(e->fd_ipv6);
#  610|   

Error: CPPCHECK_WARNING (CWE-570): [#def3]
avahi-0.9.rc1-build/avahi-0.9.rc1/avahi-core/wide-area.c:611: style[knownConditionTrueFalse]: Condition 'e->fd_ipv4>=0' is always false
#  609|               close(e->fd_ipv6);
#  610|   
#  611|->         if (e->fd_ipv4 >= 0)
#  612|               close(e->fd_ipv4);
#  613|   

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