spi: fsl_qspi: remove superfluous assignment

In

	void *rx_addr = NULL;
	rx_add = A;

the first assignment has no effect. Remove it.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 3684249..197f41f 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -407,7 +407,7 @@
 {
 	struct fsl_qspi_regs *regs = priv->regs;
 	u32 mcr_reg;
-	void *rx_addr = NULL;
+	void *rx_addr;
 
 	mcr_reg = qspi_read32(priv->flags, &regs->mcr);