nullPointerArithmeticRedundantCheck
ftp://ftp.de.debian.org/debian/pool/main/p/pforth/pforth_21.orig.tar.gz
2.18.0 pforth-21/csrc/pfcompil.c:146:54: warning: Either the condition 'NameField==NULL' is redundant or there is overflow in pointer subtraction. [nullPointerArithmeticRedundantCheck]