spi: rspi: Replaces "n" by "len" in qspi_transfer_*()

This patch replaced "n" by "len" bytes of data in qspi_transfer_in() and
qspi_transfer_out() function. This will make improving readability.
Signed-off-by: NDongCV <cv-dong@jinso.co.jp>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-rspi.c

@@ -808,7 +808,7 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
 			for (i = 0; i < len; i++)
 				rspi_write_data(rspi, *tx++);
 		} else {
-			ret = rspi_pio_transfer(rspi, tx, NULL, n);
+			ret = rspi_pio_transfer(rspi, tx, NULL, len);
 			if (ret < 0)
 				return ret;
 		}
@@ -845,7 +845,7 @@ static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
 			for (i = 0; i < len; i++)
 				*rx++ = rspi_read_data(rspi);
 		} else {
-			ret = rspi_pio_transfer(rspi, NULL, rx, n);
+			ret = rspi_pio_transfer(rspi, NULL, rx, len);
 			if (ret < 0)
 				return ret;
 		}