Most younger programmers have never heard of a libc "free"
implementation that didn't simply return without doing anything when
passed a NULL pointer, and think it weird that old fossils still write
code that tests for NULL before calling free. I've been going through
the binutils source removing these unnecessary tests. This cleans up
some generated files in opcodes/. OK to apply?
* desc-cpu.scm (@arch@_cgen_cpu_close): Free without first
checking for non-NULL.