RFR (s) 8042661 : Enhance the fix for 8030011 to avoid warnings when using -Wstring-plus-int

[Alejandro E Murillo]

Can I get a couple of reviews for this change?

webrev: http://cr.openjdk.java.net/~amurillo/9/8042661/
bug: https://bugs.openjdk.java.net/browse/JDK-8042661

Change is required to avoid warning when compiling with -Wstring-plus-int
tested with jprt and also on a standalone mac setup

Thanks

-- 
Alejandro