mtd: spi-nor-core: Try cleaning up in case writing BAR failed

Use the cleanup codepath of spi_nor_erase() also in the event of failure
of writing the BAR register.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu@linaro.org>
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 7572be5..6da7dc3 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -929,7 +929,7 @@
 #ifdef CONFIG_SPI_FLASH_BAR
 		ret = write_bar(nor, addr);
 		if (ret < 0)
-			return ret;
+			goto erase_err;
 #endif
 		write_enable(nor);