staging: lustre: lnet: remove dead code and useless wrapper

After removing commented out code, ksocknal_csum() becomes a useless
wrapper for crc32_le(). Remove it, and instead call crc32_le() directly.

Fixes the following checkpatch warning:

WARNING: space prohibited before semicolon

Signed-off-by: Dmitriy Cherkasov <dmitriy@oss-tech.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>