fix proto compare bug in example
fix proto compare bug in example

Signed-off-by: forrestchen <4247afea107df39f28a4f8a230bd359afdd992b0@tencent.com>

iovisor/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc