userfaultfd05: allow TCONF when UFFD-WP is unsupported

On system without enable CONFIG_HAVE_ARCH_USERFAULTFD_WP kernel option,
test will fail like below:

  userfaultfd05.c:95: TBROK: ioctl(3,((((2U|1U) << (((0+8)+8)+14)) |
    (((0xAA)) << (0+8)) | ((((0x3F))) << 0) |
    ((((sizeof(struct uffdio_api)))) << ((0+8)+8)))),...)
   	 failed: EINVAL (22)

The original test uses SAFE_IOCTL macro, which prematurely triggers
TBROK and prevents the test from verifying UFFD_FEATURE_PAGEFAULT_FLAG_WP.

Fixes: efd8e51 ("userfaultfd: Add test using UFFDIO_WRITEPROTECT")
Signed-off-by: Li Wang <liwang@redhat.com>
Cc: Christian Amann <camann@suse.com>
Cc: Ricardo Branco <rbranco@suse.com>

Author: wangli5665

testcases/kernel/syscalls/userfaultfd/userfaultfd05.c

@@ -92,11 +92,11 @@ static void run(void)
 
 	uffdio_api.api = UFFD_API;
 	uffdio_api.features = UFFD_FEATURE_PAGEFAULT_FLAG_WP;
-	SAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);
+	if (ioctl(uffd, UFFDIO_API, &uffdio_api) < 0) {
+		if (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP))
+			tst_brk(TCONF, "UFFD write-protect unsupported");
 
-	if (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP)) {
-		tst_brk(TCONF, "UFFD write-protect unsupported");
-		return;
+		tst_brk(TBROK | TERRNO, "ioctl() on userfaultfd failed");
 	}
 
 	uffdio_register.range.start = (unsigned long) page;