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 Behún <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>

drivers/mtd/spi/spi-nor-core.c

@@ -929,7 +929,7 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
 #ifdef CONFIG_SPI_FLASH_BAR
 		ret = write_bar(nor, addr);
 		if (ret < 0)
-			return ret;
+			goto erase_err;
 #endif
 		write_enable(nor);