RFR (XS) 8203939: JVMFlag::printError missing ATTRIBUTE_PRINTF

[Kim Barrett]

> On May 31, 2018, at 3:22 PM, Gerard Ziemski <gerard.ziemski at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this tiny fix, in which we add ATTRIBUTE_PRINTF to JVMFlag::printError.
> 
> https://bugs.openjdk.java.net/browse/JDK-8203939
> http://cr.openjdk.java.net/~gziemski/8203939_rev1
> 
> Testing via Mach5 hs-tier1,2,3
> 
> 
> cheers

Looks good.