Fix compiler warning

clang complains:

 warning: incompatible pointer to integer conversion passing
      'lispobj *' (aka 'unsigned long *') to parameter of type 'lispobj' (aka 'unsigned long');
      dereference with * [-Wint-conversion]
        || in_range_p(addr, control_stack, control_stack_size)

So cast control_stack to lispobj.  Same complaint for binding_stack
too.
2 jobs from master in 17 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #406
linux
linux-runner

00:17:20

passed #407
osx
osx-runner

00:08:23