migration: cleanup in error paths in loadvm

There's a couple of error paths in qemu_loadvm_state
which happen early on but after we've initialised the
load state; that needs to be cleaned up otherwise
we can hit asserts if the state gets reinitialised later.
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180914170430.54271-3-dgilbert@redhat.com>
Reviewed-by: NPeter Xu <peterx@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

migration/savevm.c

@@ -2333,11 +2333,13 @@ int qemu_loadvm_state(QEMUFile *f)
     if (migrate_get_current()->send_configuration) {
         if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) {
             error_report("Configuration section missing");
+            qemu_loadvm_state_cleanup();
             return -EINVAL;
         }
         ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0);
 
         if (ret) {
+            qemu_loadvm_state_cleanup();
             return ret;
         }
     }