mtd: spi-nor: hisi-sfc: Add of_node_put() before break

Each iteration of for_each_available_child_of_node puts the previous
node, but in the case of a break from the middle of the loop, there
is no put, thus causing a memory leak. Hence add an of_node_put before
the break.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

drivers/mtd/spi-nor/hisi-sfc.c

@@ -401,6 +401,7 @@ static int hisi_spi_nor_register_all(struct hifmc_host *host)
 
 		if (host->num_chip == HIFMC_MAX_CHIP_NUM) {
 			dev_warn(dev, "Flash device number exceeds the maximum chipselect number\n");
+			of_node_put(np);
 			break;
 		}
 	}