Bug #22221: Revert Qemu to old behaviour when restoring snapshots.
--- a/savevm.c
+++ b/savevm.c
@@ -2018,8 +2018,6 @@ int load_vmstate(const char *name)
     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
     if (ret < 0) {
         return ret;
-    } else if (sn.vm_state_size == 0) {
-        return -EINVAL;
     }
 
     /* Verify if there is any device that doesn't support snapshots and is
@@ -2060,6 +2058,9 @@ int load_vmstate(const char *name)
         }
     }
 
+    if (sn.vm_state_size == 0)
+        return -EINVAL;
+
     /* restore the VM state */
     f = qemu_fopen_bdrv(bs_vm_state, 0);
     if (!f) {