spi: cadence: Fix spelling mistake "nunber" -> "number"

There is a spelling mistake in a dev_err error message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Parshuram Thombare <pthombar@cadence.com>
Link: https://lore.kernel.org/r/20210928130712.990474-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-cadence-xspi.c

@@ -308,7 +308,7 @@ static int cdns_xspi_controller_init(struct cdns_xspi_dev *cdns_xspi)
 	hw_magic_num = FIELD_GET(CDNS_XSPI_MAGIC_NUM, ctrl_ver);
 	if (hw_magic_num != CDNS_XSPI_MAGIC_NUM_VALUE) {
 		dev_err(cdns_xspi->dev,
-			"Incorrect XSPI magic nunber: %x, expected: %x\n",
+			"Incorrect XSPI magic number: %x, expected: %x\n",
 			hw_magic_num, CDNS_XSPI_MAGIC_NUM_VALUE);
 		return -EIO;
 	}