RFR: 8205342: windows : potential memleaks in getAdapter(s) in NetworkInterface_winXP.c

[Baesken, Matthias]

Hello . Please review this small  fix that  fixes  potential  memory leaks in   getAdapter(s) in NetworkInterface_winXP.c  and simplifies the coding a bit too .
Currently   when generating error messages ,   some memory  is malloc-ed  for the error messages , but not always freed .


Bug:

https://bugs.openjdk.java.net/browse/JDK-8205342

webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8205342/


Thanks, Matthias


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