RFR: 7196151: ParserTest SEGv on solaris

[Peter Allwin]

Hello!

Please review this small fix for an issue where jio_snprintf may be called with a null argument causing SEGV on Solaris. This can occur if to_string is called on a GenDCmdArgument<char*> with no default value.

cr: http://cr.openjdk.java.net/~allwin/7196151/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-7196151


serviceability/ParserTest.java reproduces this issue and the fix has been verified with this test.


Thanks!
/peter
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