obstack.c defines a variable that isn't used

[Paul Eggert]

obstack.c defines a global variable _obstack that is not used, and
hasn't been used as far back as I can see.  Any use of it must predate
CVS revision 1.1 of obstack.c and obstack.h (dated 1996).  I did find
a copy of glibc 1.06.4 on the net (dated 1993) and it isn't used there
either.  So it should be safe to remove it.

2004-05-19  Paul Eggert  <eggert@cs.ucla.edu>

	* malloc/obstack.c (_obstack): Remove unused variable.
	It hasn't been used by glibc since at least 1.06.4 (dated 1993).

Index: lib/obstack.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/obstack.c,v
retrieving revision 1.25
diff -p -u -r1.25 obstack.c
--- lib/obstack.c	17 May 2004 07:52:52 -0000	1.25
+++ lib/obstack.c	19 May 2004 20:00:32 -0000
@@ -102,11 +102,6 @@ int obstack_exit_failure = EXIT_FAILURE;
 #  define obstack_exit_failure exit_failure
 # endif
 
-/* The non-GNU-C macros copy the obstack into this global variable
-   to avoid multiple evaluation.  */
-
-struct obstack *_obstack;
-
 /* Define a macro that either calls functions with the traditional malloc/free
    calling interface, or calls functions with the mmalloc/mfree interface
    (that adds an extra first argument), based on the state of use_extra_arg.