Only track block error events instead of logging sucessful ones. The
upstream patch (9c86f6255f67a8) had to be modified since it relies on
the kernel version to determine if the new trace point is available or
not. Such tests are meaningless in RHEL as we backport a lot of patches
while keeping the kernel version intact.
Resolves: RHEL-8708
Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
