constify to_detach

constify to_detach

This patch constifies the target_ops method to_detach.

This is a small cleanup, but also, I think, a bug-prevention fix,
since gdb already acts as if the "args" argument here was const.

In particular, top.c:quit_force calls kill_or_detach via
iterate_over_inferiors.  kill_or_detach calls target_detach, passing
the same argument each time.  So, if one of these methods was not
const-correct, then kill_or_detach would change its behavior in a
strange way.

I could not build every target I modified in this patch.  I've
inspected them all by hand, though.  Many targets do not use the
"args" parameter; a couple pass it to atoi; and a few pass it on to
the to_detach method of the target beneath.  The only code that
required a real change was in linux-nat.c, and that only needed the
introduction of a temporary variable for const-correctness.

2013-11-08  Tom Tromey  <tromey@redhat.com>

	* aix-thread.c (aix_thread_detach): Update.
	* corelow.c (core_detach): Update.
	* darwin-nat.c (darwin_detach): Update.
	* dec-thread.c (dec_thread_detach): Update.
	* gnu-nat.c (gnu_detach): Update.
	* go32-nat.c (go32_detach): Update.
	* inf-ptrace.c (inf_ptrace_detach): Update.
	* inf-ttrace.c (inf_ttrace_detach): Update.
	* linux-fork.c (linux_fork_detach): Update.
	* linux-fork.h (linux_fork_detach): Update.
	* linux-nat.c (linux_nat_detach): Update.  Introduce "tem"
	local for const-correctness.
	* linux-thread-db.c (thread_db_detach): Update.
	* monitor.c (monitor_detach): Update.
	* nto-procfs.c (procfs_detach): Update.
	* procfs.c (procfs_detach): Update.
	* record.c (record_detach): Update.
	* record.h (record_detach): Update.
	* remote-m32r-sdi.c (m32r_detach): Update.
	* remote-mips.c (mips_detach): Update.
	* remote-sim.c (gdbsim_detach): Update.
	* remote.c (remote_detach_1, remote_detach)
	(extended_remote_detach): Update.
	* sol-thread.c (sol_thread_detach): Update.
	* target.c (target_detach): Make "args" const.
	(init_dummy_target): Update.
	* target.h (struct target_ops) <to_detach>: Make argument const.
	(target_detach): Likewise.
	* windows-nat.c (windows_detach): Update.