request for approval, 7168110: Misleading jstack error message

[Rob McKenna]

Hi,

I'd like to request approval to push 7168110 into 7u. Its a trivial 
change that fixes cleans up a cryptic error message. It has already been 
pushed to jdk8 (and is identical to that change):

http://cr.openjdk.java.net/~robm/7168110/webrev.01/ 
<http://cr.openjdk.java.net/%7Erobm/7168110/webrev.01/>

     -Rob