spi: rockchip: init rxconf and txconf to 0

Dmac pl330 adds src_interlace_size of dma_slave_config rxconf.
If rxconf is local variable, src_interlace_size may be non zero,
which causes wrong process.

Fixes: ddd2e87 ("dmaengine: pl330: add support for interlace size config")
Change-Id: Ib301c7ca4a1175bafd0631cb4deea4baa60eebc7
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>

Author: Huibin Hong

drivers/spi/spi-rockchip.c

@@ -439,6 +439,9 @@ static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
 	struct dma_slave_config rxconf, txconf;
 	struct dma_async_tx_descriptor *rxdesc, *txdesc;
 
+	memset(&rxconf, 0, sizeof(struct dma_slave_config));
+	memset(&txconf, 0, sizeof(struct dma_slave_config));
+
 	spin_lock_irqsave(&rs->lock, flags);
 	rs->state &= ~RXBUSY;
 	rs->state &= ~TXBUSY;