remoteproc: mediatek: Refine ipi handler error message

The error message doesn't accurately reflect the cause of
the error. The error is due to a handler not being found,
not an invalid IPI ID.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230901080935.14571-14-tinghan.shen@mediatek.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: tinghan-shen

drivers/remoteproc/mtk_scp.c

@@ -112,7 +112,7 @@ static void scp_ipi_handler(struct mtk_scp *scp)
 	scp_ipi_lock(scp, id);
 	handler = ipi_desc[id].handler;
 	if (!handler) {
-		dev_err(scp->dev, "No such ipi id = %d\n", id);
+		dev_err(scp->dev, "No handler for ipi id = %d\n", id);
 		scp_ipi_unlock(scp, id);
 		return;
 	}