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: cd34fd8c75 ("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>

tools/testing/selftests/kvm/x86/pmu_counters_test.c

@@ -174,7 +174,7 @@ do {										\
 
 #define GUEST_TEST_EVENT(_idx, _event, _pmc, _pmc_msr, _ctrl_msr, _value, FEP)	\
 do {										\
-	wrmsr(pmc_msr, 0);							\
+	wrmsr(_pmc_msr, 0);							\
 										\
 	if (this_cpu_has(X86_FEATURE_CLFLUSHOPT))				\
 		GUEST_MEASURE_EVENT(_ctrl_msr, _value, "clflushopt .", FEP);	\
@@ -331,9 +331,9 @@ __GUEST_ASSERT(expect_gp ? vector == GP_VECTOR : !vector,			\
 	       expect_gp ? "#GP" : "no fault", msr, vector)			\
 
 #define GUEST_ASSERT_PMC_VALUE(insn, msr, val, expected)			\
-	__GUEST_ASSERT(val == expected_val,					\
+	__GUEST_ASSERT(val == expected,					\
 		       "Expected " #insn "(0x%x) to yield 0x%lx, got 0x%lx",	\
-		       msr, expected_val, val);
+		       msr, expected, val);
 
 static void guest_test_rdpmc(uint32_t rdpmc_idx, bool expect_success,
 			     uint64_t expected_val)