Redirect error to null if /proc/sys/crypto/fips_enabled doesn't exist

Currently, kdump/config-any test [1] failed against rawhide kernel which
somehow doesn't have FIPS enabled [2]. And kdump/config-any will warn if
logs contain "No such file or directory" [3] and warning by default is
treated as a test failure by tmt.

Suppress the error to keep the test green.

[1] https://artifacts.osci.redhat.com/testing-farm/fdacf2c1-c54f-4467-b8c9-25bdd2d021e0/
[2] https://bugzilla.redhat.com/show_bug.cgi?id=2372994
[3] https://gitlab.com/redhat/centos-stream/tests/kernel/kernel-tests/-/blob/845025235f5c3d6ccc4e462f215d935999606893/kdump/include/kdump.sh#L446

Signed-off-by: Coiby Xu <[email protected]>

Author: coiby

mkdumprd

@@ -433,7 +433,7 @@ if ! is_fadump_capable; then
 	# If /boot is not on a separate partition, the fips dracut module will
 	# link /sysroot/boot to /boot. So we need to mount the root partition
 	# to /sysroot beforehand.
-	if [[ $(cat /proc/sys/crypto/fips_enabled) == 1  ]]; then
+	if [[ $(cat /proc/sys/crypto/fips_enabled 2> /dev/null) == 1  ]]; then
 		_boot_source=$(findmnt -n -o SOURCE --target /boot)
 		if mountpoint -q /boot; then
 			dracut_args+=(--add-device "$_boot_source")