remove the warning for map.lookup_or_init() (#2581)
remove the warning for map.lookup_or_init() (#2581)

Commit 82f4302a651a ("introduce map.lookup_or_try_init()")
introduced new API map.lookup_or_try_init(). A compile time
warning is introduced if old map.lookup_or_init() is used
to discourage the usage.

The API is still supported and documentation already
recommends using the new one. So let us drop the
warning.

Signed-off-by: Yonghong Song <e76892bbe783db2f627de1232e139db4de43da60@fb.com>
brendangregg/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,brendangregg/bcc,tuxology/bcc,tuxology/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,tuxology/bcc,iovisor/bcc