[OpenJDK 2D-Dev] RFR [XS]: 8231445: check ZALLOC return values in awt coding

[Baesken, Matthias]

Hello, please review this small fix .  It deals with return value checking of ZALLOC .

ZALLOC is a macro using calloc, please  see :

jdk/src/java.desktop/unix/native/common/awt/awt_p.h
/* allocated and initialize a structure */
#define ZALLOC(T) ((struct T *)calloc(1, sizeof(struct T)))

    ...   so the return value has to be checked which is missing at some places.


Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8231445

http://cr.openjdk.java.net/~mbaesken/webrevs/8231445.0/


Thanks, Matthias
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