libtraceevent: Remove unneeded semicolon

Fixes coccicheck warning:

 tools/lib/traceevent/kbuffer-parse.c:441:2-3: Unneeded semicolon

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/1588065121-71236-1-git-send-email-zou_wei@huawei.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>