migration: set file error on subsection loading

commit 13cde508 ("vmstate: Return error in case of error") sets
QemuFile error to stop reading from it and report to the caller (checked
by unit tests). We should do the same on subsection loading error.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231024084043.2926316-8-marcandre.lureau@redhat.com>

migration/vmstate.c

@@ -179,6 +179,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
     assert(field->flags == VMS_END);
     ret = vmstate_subsection_load(f, vmsd, opaque);
     if (ret != 0) {
+        qemu_file_set_error(f, ret);
         return ret;
     }
     if (vmsd->post_load) {