For qemu_open_old(), osdep.h said:

> Don't introduce new usage of this function, prefer the following
> qemu_open/qemu_create that take an "Error **errp".

So replace qemu_open_old() with qemu_open(). And considering the SGX
enablement description is useful, convert it into a error message hint.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Eduardo Habkost <eduardo@habkost.net>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 hw/i386/sgx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/i386/sgx.c b/hw/i386/sgx.c
index de76397bcfb3..a14a84bc6f69 100644
--- a/hw/i386/sgx.c
+++ b/hw/i386/sgx.c
@@ -157,10 +157,12 @@ SGXInfo *qmp_query_sgx_capabilities(Error **errp)
 {
     SGXInfo *info = NULL;
     uint32_t eax, ebx, ecx, edx;
+    Error *local_err = NULL;
 
-    int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
+    int fd = qemu_open("/dev/sgx_vepc", O_RDWR, &local_err);
     if (fd < 0) {
-        error_setg(errp, "SGX is not enabled in KVM");
+        error_append_hint(&local_err, "SGX is not enabled in KVM");
+        error_propagate(errp, local_err);
         return NULL;
     }
 
-- 
2.34.1