Is this bit of code obsolete?

I am getting a compiler warning about this code in libsvn_ra_dav/commit.c

/*
** singleton_delete_prop:
**
** The address of this integer is used as a "singleton" value to mark
** properties which must be deleted. Properties which are changed/added
** will use their new values.
*/
static const int singleton_delete_prop = 0;
#define DELETE_THIS_PROP (&singleton_delete_prop)

Since neither singleton_delete_prop nor DELETE_THIS_PROP are used in
the file I propose to delete it. Am I missing something subtle?

-- 
Philip
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