Need reviewer: a couple of hprof fixes for Parfait

[Kelly O'Hair]

Need reviewer.

I was asked to look at some Parfait errors in hprof code:

7176138: Fixes for missing close() calls and possible null pointer reference 
instead of fatal error
http://cr.openjdk.java.net/~ohair/openjdk8/parfait_hprof_fixes/webrev/

-kto