Fix userfaultfd_api to return EINVAL as expected

In the Linux kernel, the following vulnerability has been resolved:

Fix userfaultfd_api to return EINVAL as expected

Currently if we request a feature that is not set in the Kernel config we

fail silently and return all the available features. However, the man

page indicates we should return an EINVAL.

We need to fix this issue since we can end up with a Kernel warning should

a program request the feature UFFD_FEATURE_WP_UNPOPULATED on a kernel with

the config not set with this feature.

[ 200.812896] WARNING: CPU: 91 PID: 13634 at mm/memory.c:1660 zap_pte_range+0x43d/0x660

[ 200.820738] Modules linked in:

[ 200.869387] CPU: 91 PID: 13634 Comm: userfaultfd Kdump: loaded Not tainted 6.9.0-rc5+ #8

[ 200.877477] Hardware name: Dell Inc. PowerEdge R6525/0N7YGH, BIOS 2.7.3 03/30/2022

[ 200.885052] RIP: 0010:zap_pte_range+0x43d/0x660