[GR-6239] Fix coredump in ggsave.

...c/com/oracle/truffle/r/library/fastrGrid/DisplayList.java

.../truffle/r/library/fastrGrid/FastRGridExternalLookup.java

...src/com/oracle/truffle/r/library/fastrGrid/GridState.java

...rc/com/oracle/truffle/r/library/fastrGrid/LGridDirty.java

.../src/com/oracle/truffle/r/library/fastrGrid/ViewPort.java

...oracle/truffle/r/library/fastrGrid/grDevices/DevSize.java

...ffle/r/library/fastrGrid/grDevices/OpenDefaultDevice.java

...com/oracle/truffle/r/library/fastrGrid/graphics/CPar.java

...ve/fficall/src/truffle_common/Rinternals_truffle_common.h