mtd: spi-nor: Fix some error codes in cqspi_setup_flash()

We return success or possibly uninitialized values on these error paths
instead of proper error codes.

Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller")
Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Marek Vasut <[e-mail]>
Reviewed-by: Moritz Fischer <[e-mail]>
Signed-off-by: Cyrille Pitchen <[e-mail]>

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

···
 
 	/* Get flash device data */
 	for_each_available_child_of_node(dev->of_node, np) {
-		if (of_property_read_u32(np, "reg", &cs)) {
+		ret = of_property_read_u32(np, "reg", &cs);
+		if (ret) {
 			dev_err(dev, "Couldn't determine chip select.\n");
 			goto err;
 		}
 
 		if (cs >= CQSPI_MAX_CHIPSELECT) {
+			ret = -EINVAL;
 			dev_err(dev, "Chip select %d out of range.\n", cs);
 			goto err;
 		}