staging: mt7621-spi: remove unused lock.

This lock is never initialized, locked once, and never unlocked.
Clearly it is pointless - so remove it.
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-spi/spi-mt7621.c

@@ -65,7 +65,6 @@ struct mt7621_spi {
 	unsigned int		sys_freq;
 	unsigned int		speed;
 	struct clk		*clk;
-	spinlock_t		lock;
 
 	struct mt7621_spi_ops	*ops;
 };
@@ -395,7 +394,6 @@ static int mt7621_spi_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	struct spi_master *master;
 	struct mt7621_spi *rs;
-	unsigned long flags;
 	void __iomem *base;
 	struct resource *r;
 	int status = 0;
@@ -447,7 +445,6 @@ static int mt7621_spi_probe(struct platform_device *pdev)
 	rs->sys_freq = clk_get_rate(rs->clk);
 	rs->ops = ops;
 	dev_info(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
-	spin_lock_irqsave(&rs->lock, flags);
 
 	device_reset(&pdev->dev);