spi: cadence-quadspi: Add missing blank line in cqspi_request_mmap_dma()

Fix "WARNING: Missing a blank line after declarations" reported by
checkpatch.pl.
Signed-off-by: NIan Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20220510115141.212779-2-abbotti@mev.co.ukSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-cadence-quadspi.c

@@ -1481,6 +1481,7 @@ static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
 	cqspi->rx_chan = dma_request_chan_by_mask(&mask);
 	if (IS_ERR(cqspi->rx_chan)) {
 		int ret = PTR_ERR(cqspi->rx_chan);
+
 		cqspi->rx_chan = NULL;
 		return dev_err_probe(&cqspi->pdev->dev, ret, "No Rx DMA available\n");
 	}