spi: axi-spi-engine: remove completed_id from driver state

In the AXI SPI Engine driver, the completed_id field in the driver
state is only used in one function and the value does not need to
persist between function calls. Therefore, it can be removed from the
driver state and made a local variable in the function where it is used.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231117-axi-spi-engine-series-1-v1-11-cc59db999b87@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-axi-spi-engine.c

@@ -115,7 +115,6 @@ struct spi_engine {
 
 	struct spi_message *msg;
 	struct ida sync_ida;
-	unsigned int completed_id;
 
 	unsigned int int_enable;
 };
@@ -380,13 +379,14 @@ static irqreturn_t spi_engine_irq(int irq, void *devid)
 	struct spi_engine *spi_engine = spi_controller_get_devdata(host);
 	unsigned int disable_int = 0;
 	unsigned int pending;
+	int completed_id = -1;
 
 	pending = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 
 	if (pending & SPI_ENGINE_INT_SYNC) {
 		writel_relaxed(SPI_ENGINE_INT_SYNC,
 			spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
-		spi_engine->completed_id = readl_relaxed(
+		completed_id = readl_relaxed(
 			spi_engine->base + SPI_ENGINE_REG_SYNC_ID);
 	}
 
@@ -410,7 +410,7 @@ static irqreturn_t spi_engine_irq(int irq, void *devid)
 	if (pending & SPI_ENGINE_INT_SYNC && spi_engine->msg) {
 		struct spi_engine_message_state *st = spi_engine->msg->state;
 
-		if (spi_engine->completed_id == st->sync_id) {
+		if (completed_id == st->sync_id) {
 			struct spi_message *msg = spi_engine->msg;
 
 			msg->status = 0;