KVM: selftests: Fix printf() format goof in SEV smoke test

Print out the index of mismatching XSAVE bytes using unsigned decimal
format.  Some versions of clang complain about trying to print an integer
as an unsigned char.

  x86/sev_smoke_test.c:55:51: error: format specifies type 'unsigned char'
                                     but the argument has type 'int' [-Werror,-Wformat]

Fixes: 8c53183dbaa2 ("selftests: kvm: add test for transferring FPU state into VMSA")
Link: https://lore.kernel.org/r/20250228233852.3855676-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
index a1a688e752666cd06f10c97b7c10c906068b4711..d97816dc476a272e8961bd6f716b5de91154b1e9 100644 (file)
--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c
+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
@@ -52,7 +52,8 @@ static void compare_xsave(u8 *from_host, u8 *from_guest)
        bool bad = false;
        for (i = 0; i < 4095; i++) {
                if (from_host[i] != from_guest[i]) {
-                       printf("mismatch at %02hhx | %02hhx %02hhx\n", i, from_host[i], from_guest[i]);
+                       printf("mismatch at %u | %02hhx %02hhx\n",
+                              i, from_host[i], from_guest[i]);
                        bad = true;
                }
        }