EDAC, fsl_ddr: Fix error return code in fsl_mc_err_probe()

Return negative error code from the edac_mc_add_mc() error handling case
instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: York Sun <york.sun@nxp.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1473350284-26482-1-git-send-email-weiyj.lk@gmail.com
Signed-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/fsl_ddr_edac.c

@@ -564,7 +564,8 @@ int fsl_mc_err_probe(struct platform_device *op)
 	/* clear all error bits */
 	ddr_out32(pdata->mc_vbase + FSL_MC_ERR_DETECT, ~0);
 
-	if (edac_mc_add_mc_with_groups(mci, fsl_ddr_dev_groups)) {
+	res = edac_mc_add_mc_with_groups(mci, fsl_ddr_dev_groups);
+	if (res) {
 		edac_dbg(3, "failed edac_mc_add_mc()\n");
 		goto err;
 	}