hw/audio: Constify VMState

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-24-richard.henderson@linaro.org>
diff --git a/hw/audio/lm4549.c b/hw/audio/lm4549.c
index e7bfcc4..a4a77c8 100644
--- a/hw/audio/lm4549.c
+++ b/hw/audio/lm4549.c
@@ -329,7 +329,7 @@
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = lm4549_post_load,
-    .fields = (VMStateField[]) {
+    .fields = (const VMStateField[]) {
         VMSTATE_UINT32(voice_is_active, lm4549_state),
         VMSTATE_UINT16_ARRAY(regfile, lm4549_state, 128),
         VMSTATE_UINT16_ARRAY(buffer, lm4549_state, LM4549_BUFFER_SIZE),