8363676: [GCC static analyzer] missing return value check of malloc in OGLContext_SetTransform

[MBaesken]

When using the GCC static analyzer (-fanalyzer) the following issue is reported :
src/java.desktop/share/native/common/java2d/opengl/OGLContext.c:487:9: warning: use of possibly-NULL '*oglc.xformMatrix' where non-null expected [CWE-690] [-Wanalyzer-possible-null-argument]

Seems we miss a NULL check of the return value of malloc (at most other places in the coding we do it).

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• JDK-8363676: [GCC static analyzer] missing return value check of malloc in OGLContext_SetTransform (Bug - P4)

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