perf: remove duplicate check on fwnode

fwnode is checked IS_ERR_OR_NULL in following check by
is_of_node() or is_acpi_device_node(), remove duplicate check.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1604644902-29655-1-git-send-email-wangqing@vivo.com


Signed-off-by: Will Deacon <will@kernel.org>