platform/olpc: Remove redundant null pointer checks in olpc_ec_setup_debugfs()

platform/olpc: Remove redundant null pointer checks in olpc_ec_setup_debugfs()

Since the debugfs_create_dir() never returns a null pointer, checking
the return value for a null pointer is redundant. Since
debugfs_create_file() can deal with a ERR_PTR() style pointer, drop
the check.

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20240907031009.3591057-2-lizetao1@huawei.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>