RFR [XS]: 8234968: check calloc rv in libinstrument InvocationAdapter

[Baesken, Matthias]

Hello, please review this small  patch .
It adds return value checking for calloc at one place where it is missing .

Thanks, Matthias

Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8234968

http://cr.openjdk.java.net/~mbaesken/webrevs/8234968.1/


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