mtd: spi-nor: cadence-quadspi: fix spelling mistake: "Couldnt't" -> "Couldn't"

There is a spelling mistake in a dev_error message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

drivers/mtd/spi-nor/cadence-quadspi.c

@@ -1249,7 +1249,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 
 	ddata = of_device_get_match_data(dev);
 	if (!ddata) {
-		dev_err(dev, "Couldnt't find driver data\n");
+		dev_err(dev, "Couldn't find driver data\n");
 		return -EINVAL;
 	}
 	hwcaps.mask = ddata->hwcaps_mask;