RFR 8191132: assert condition should not be in quotes

[harold seigel]

Hi,

Please review this simple fix for a bad assert condition.

Open Webrev: 
http://javaweb.us.oracle.com/~hseigel/webrev/bug_8191132/webrev/index.html

JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8191132

The fix was tested with JPRT, JCK Lang and VM, and Mach5 tier1 - tier5 
tests to make sure the new assert did not trigger.

Thanks, Harold