libwebsockets

coverity: fixes plugin error path leak and logging method sign check

Broadened the checking config to

cmake .. -DCMAKE_BUILD_TYPE=DEBUG \
         -DLWS_WITH_SYS_ASYNC_DNS=1 \
         -DLWS_WITH_SYS_NTPCLIENT=1 \
         -DLWS_WITH_SYS_DHCP_CLIENT=1 \
         -DLWS_WITH_GENCRYPTO=1 \
         -DLWS_WITH_DETAILED_LATENCY=1 \
         -DLWS_IPV6=1 \
         -DLWS_WITH_FTS=1 \
         -DLWS_WITH_LWSWS=1 \
         -DLWS_UNIX_SOCK=1 \
         -DLWS_WITH_HTTP_PROXY=1 \
         -DLWS_WITH_MINIMAL_EXAMPLES=1