KVM: selftests: Make TEST_ASSERT_EQ() output look like normal TEST_ASSERT()

Clean up TEST_ASSERT_EQ() so that the (mostly) raw code is captured in the
main assert message, not the helper macro's code.  E.g. make this:

  x86_64/tsc_msrs_test.c:106: __a == __b
  pid=40470 tid=40470 errno=0 - Success
     1	0x000000000040170e: main at tsc_msrs_test.c:106
     2	0x0000000000416f23: __libc_start_call_main at libc-start.o:?
     3	0x000000000041856f: __libc_start_main_impl at ??:?
     4	0x0000000000401ef0: _start at ??:?
  TEST_ASSERT_EQ(rounded_host_rdmsr(MSR_IA32_TSC), val + 1) failed.
	rounded_host_rdmsr(MSR_IA32_TSC) is 0
	val + 1 is 0x1

look like this:

  x86_64/tsc_msrs_test.c:106: rounded_host_rdmsr(MSR_IA32_TSC) == val + 1
  pid=5737 tid=5737 errno=0 - Success
     1	0x0000000000401714: main at tsc_msrs_test.c:106
     2	0x0000000000415c23: __libc_start_call_main at libc-start.o:?
     3	0x000000000041726f: __libc_start_main_impl at ??:?
     4	0x0000000000401e60: _start at ??:?
  0 != 0x1 (rounded_host_rdmsr(MSR_IA32_TSC) != val + 1)

Opportunstically clean up the formatting of the entire macro.

Link: https://lore.kernel.org/r/20230729003643.1053367-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

tools/testing/selftests/kvm/include/test_util.h

@@ -53,14 +53,13 @@ void test_assert(bool exp, const char *exp_str,
 #define TEST_ASSERT(e, fmt, ...) \
 	test_assert((e), #e, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
 
-#define TEST_ASSERT_EQ(a, b) do { \
-	typeof(a) __a = (a); \
-	typeof(b) __b = (b); \
-	TEST_ASSERT(__a == __b, \
-		    "TEST_ASSERT_EQ(%s, %s) failed.\n" \
-		    "\t%s is %#lx\n" \
-		    "\t%s is %#lx", \
-		    #a, #b, #a, (unsigned long) __a, #b, (unsigned long) __b); \
+#define TEST_ASSERT_EQ(a, b)						\
+do {									\
+	typeof(a) __a = (a);						\
+	typeof(b) __b = (b);						\
+	test_assert(__a == __b, #a " == " #b, __FILE__, __LINE__,	\
+		    "%#lx != %#lx (%s != %s)",				\
+		    (unsigned long)(__a), (unsigned long)(__b), #a, #b);\
 } while (0)
 
 #define TEST_ASSERT_KVM_EXIT_REASON(vcpu, expected) do {		\