[XS] RFR : 8180945 : vmError.cpp : adjust dup and fclose

[Baesken, Matthias]

Hello,
    could I please have a  review for  the following small change .
In vmError.cpp  there is a part where  the dup return code in case of an error is not handled, and additionally fclose might be called with parameter NULL .
The change adjusts this.

Bug :

https://bugs.openjdk.java.net/browse/JDK-8180945

webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8180945/


Thanks, Matthias