Fix CString::RandomString() to not insert NULL bytes in its result
Fix CString::RandomString() to not insert NULL bytes in its result

sizeof() also includes the trailing NULL byte and thus that character was
chosen sometimes, too.


git-svn-id: 3ad904ec35b89a071badd9cb0113dfe58093e920@1052 726aef4b-f618-498e-8847-2d620e286838

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