mtd: nand: omap: fix error return code in omap_nand_probe()

Fix to return a negative error code from the error handling case instead
of 0, to more closely match the rest of this function.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Acked-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/omap2.c

@@ -1953,7 +1953,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
 		/* This ECC scheme requires ELM H/W block */
-		if (is_elm_present(info, pdata->elm_of_node, BCH8_ECC) < 0) {
+		err = is_elm_present(info, pdata->elm_of_node, BCH8_ECC);
+		if (err < 0) {
 			pr_err("nand: error: could not initialize ELM\n");
 			goto return_error;
 		}