KVM: selftests: Fix typos in x86's PMU counter test's macro variable use

KVM: selftests: Fix typos in x86's PMU counter test's macro variable use

Fix goofs in PMU counter test's assertion macros where the macros
unintentionally reference variables in the parent scope.  The code "works"
as-is purely by accident, as all users define a variable with the correct
name (and usage).

Fixes: cd34fd8c758e ("KVM: selftests: Test PMC virtualization with forced emulation")
Signed-off-by: Colton Lewis <coltonlewis@google.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20240918205319.3517569-2-coltonlewis@google.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>