virt: fsl_hypervisor: Directly return 0 instead of using local ret variable

fixes coccinelle warning:
drivers/virt/fsl_hypervisor.c:690:5-8: Unneeded variable: "ret". Return "0" on line 698

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Link: https://lore.kernel.org/r/1646966331-16813-1-git-send-email-baihaowen@meizu.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>