MFC r322218: MFV r322217: 8418 zfs_prop_get_table() call in zfs_validate_name() is a no-op

illumos/illumos-gate@e09ba01dcda5e24964b8632718777b39166d86e4
https://github.com/illumos/illumos-gate/commit/e09ba01dcda5e24964b8632718777b39166d86e4

https://www.illumos.org/issues/8418

The following line in zfs_validate_name() is just a no-op and it
should be removed:
    108    (void) zfs_prop_get_table();

Reviewed by: Vitaliy Gusev <gusev.vitaliy@icloud.com>
Approved by: Matthew Ahrens <mahrens@delphix.com>
Author: Marcel Telka <marcel@telka.sk>