OMAP: mailbox: remove unreachable return

Remove unreachable return statement.
Signed-off-by: NOmar Ramirez Luna <omar.ramirez@ti.com>
Acked-by: NBenoit Cousson <b-cousson@ti.com>
Acked-by: NHiroshi Doyu <hiroshi.doyu@nokia.com>

arch/arm/mach-omap2/mailbox.c

@@ -432,9 +432,8 @@ static int __devinit omap2_mbox_probe(struct platform_device *pdev)
 		iounmap(mbox_base);
 		return ret;
 	}
-	return 0;
 
-	return ret;
+	return 0;
 }
 
 static int __devexit omap2_mbox_remove(struct platform_device *pdev)