spi_bfin5xx: flush() returns -1 when no stop and clear stat was found

in bfin_spi_pump_transfers()

        /* Setup the transfer state based on the type of transfer */
        if (bfin_spi_flush(drv_data) == 0) {
                dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");

...

But when limit is reached, bfin_spi_flush() returns -1.

---

index f014cc2..ada9b54 100644
@@ -169,8 +169,10 @@ static int bfin_spi_flush(struct driver_data *drv_data)
 	unsigned long limit = loops_per_jiffy << 1;
 
 	/* wait for stop and clear stat */
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF) && limit--)
+	while (!(read_STAT(drv_data) & BIT_STAT_SPIF) && limit) {
 		cpu_relax();
+		limit--;
+	}
 
 	write_STAT(drv_data, BIT_STAT_CLR);
 

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