net, netfilter: Remove redundant goto in ebt_ulog_packet

In net/bridge/netfilter/ebt_ulog.c:ebt_ulog_packet() the 'goto unlock'
before the 'alloc_failure' label is completely redundant. This patch
removes it.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>