EDAC, mv64x60: Check driver registration success

Check the return status of platform_driver_register() in
mv64x60_edac_init(). Only output messages and initialise the
edac_op_state if the registration is successful.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20170529212142.25572-2-chris.packham@alliedtelesis.co.nz
Signed-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/mv64x60_edac.c

@@ -853,10 +853,15 @@ static struct platform_driver * const drivers[] = {
 
 static int __init mv64x60_edac_init(void)
 {
-	int ret = 0;
+	int ret;
+
+	ret = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+	if (ret)
+		return ret;
 
 	printk(KERN_INFO "Marvell MV64x60 EDAC driver " MV64x60_REVISION "\n");
 	printk(KERN_INFO "\t(C) 2006-2007 MontaVista Software\n");
+
 	/* make sure error reporting method is sane */
 	switch (edac_op_state) {
 	case EDAC_OPSTATE_POLL:
@@ -867,7 +872,7 @@ static int __init mv64x60_edac_init(void)
 		break;
 	}
 
-	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+	return 0;
 }
 module_init(mv64x60_edac_init);