Remove a bit of dead code, spotted by Florian using Coverity.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2646 8f6e269a-dfd6-0310-a8e1-e2731360e62c
Fold out an expression which is always False.  Spotted by Florian using Coverity.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2647 8f6e269a-dfd6-0310-a8e1-e2731360e62c