target/i386: kvm: Delete VMX migration blocker on vCPU init failure

Commit d98f2607 ("target/i386: kvm: add VMX migration blocker")
added migration blocker for vCPU exposed with Intel VMX because QEMU
doesn't yet contain code to support migration of nested virtualization
workloads.

However, that commit missed adding deletion of the migration blocker in
case init of vCPU failed. Similar to invtsc_mig_blocker. This commit fix
that issue.

Fixes: d98f2607 ("target/i386: kvm: add VMX migration blocker")
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Reviewed-by: NMaran Wilson <maran.wilson@oracle.com>
Message-Id: <20190619162140.133674-2-liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

target/i386/kvm.c

@@ -1333,7 +1333,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
 
     r = kvm_arch_set_tsc_khz(cs);
     if (r < 0) {
-        goto fail;
+        return r;
     }
 
     /* vcpu's TSC frequency is either specified by user, or following
@@ -1622,7 +1622,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
             if (local_err) {
                 error_report_err(local_err);
                 error_free(invtsc_mig_blocker);
-                return r;
+                goto fail2;
             }
         }
     }
@@ -1673,6 +1673,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
 
  fail:
     migrate_del_blocker(invtsc_mig_blocker);
+ fail2:
+    migrate_del_blocker(vmx_mig_blocker);
+
     return r;
 }