media: venus: hfi: Remove the unneeded result variable

Return the value venus_hfi_create() directly instead of storing it in
another redundant variable.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>