* src/output.c (output): Remove useless variables.

* src/output.c (output): Remove useless variables.
* lib/obstack.c (obstack_grow, obstack_grow0): Rename the second
argument `data' for consistency with the prototypes.
Qualify it `const'.
(obstack_copy, obstack_copy0): Rename the second argument as
`address' for consistency.  Qualify it `const'.
* lib/obstack.h (obstack_copy, obstack_copy0, obstack_grow)
(obstack_grow0, obstack_ptr_grow, obstack_ptr_grow_fast): Qualify
`const' their input argument (`data' or `address').
Adjust the corresponding macros to include `const' in casts.