hw/input: Constify VMState

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-34-richard.henderson@linaro.org>
diff --git a/hw/input/pl050.c b/hw/input/pl050.c
index ec5e192..6519e26 100644
--- a/hw/input/pl050.c
+++ b/hw/input/pl050.c
@@ -30,7 +30,7 @@
     .name = "pl050",
     .version_id = 2,
     .minimum_version_id = 2,
-    .fields = (VMStateField[]) {
+    .fields = (const VMStateField[]) {
         VMSTATE_UINT32(cr, PL050State),
         VMSTATE_UINT32(clk, PL050State),
         VMSTATE_UINT32(last, PL050State),