target/i386/sev: Use g_autofree in sev_launch_get_measure()

Use g_autofree to remove a pair of g_free/goto.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211007161716.453984-13-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/sev.c

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 3a30ba6..5cbbcf0 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -685,8 +685,8 @@
 {
     SevGuestState *sev = sev_guest;
     int ret, error;
-    guchar *data;
-    struct kvm_sev_launch_measure *measurement;
+    g_autofree guchar *data = NULL;
+    g_autofree struct kvm_sev_launch_measure *measurement = NULL;
 
     if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
         return;
@@ -708,7 +708,7 @@
     if (!measurement->len) {
         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
                      __func__, ret, error, fw_error_to_str(errno));
-        goto free_measurement;
+        return;
     }
 
     data = g_new0(guchar, measurement->len);
@@ -720,7 +720,7 @@
     if (ret) {
         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
                      __func__, ret, error, fw_error_to_str(errno));
-        goto free_data;
+        return;
     }
 
     sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
@@ -728,11 +728,6 @@
     /* encode the measurement value and emit the event */
     sev->measurement = g_base64_encode(data, measurement->len);
     trace_kvm_sev_launch_measurement(sev->measurement);
-
-free_data:
-    g_free(data);
-free_measurement:
-    g_free(measurement);
 }
 
 char *