ARM: mvebu: Use the a standard errno in mvebu_get_soc_id

Instead of using -1 as error value, use a standard errno.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1403274953-21790-2-git-send-email-gregory.clement@free-electrons.comAcked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/mvebu-soc-id.c

@@ -51,7 +51,7 @@ int mvebu_get_soc_id(u32 *dev, u32 *rev)
 		*rev = soc_rev;
 		return 0;
 	} else
-		return -1;
+		return -ENODEV;
 }
 
 static int __init mvebu_soc_id_init(void)