Fix an invalid usage of SVN_VA_NULL.
* subversion/libsvn_wc/wc_db.c
(init_db): SVN_VA_NULL is a sentinel, so don't use it in the middle of
the argument list for svn_sqlite__bindf().  Use a regular NULL instead.
@@ -1409,7 +1409,7 @@ init_db(/* output values */
*wc_id, /* 1 */
"", /* 2 */
0, /* op_depth is 0 for base */
- SVN_VA_NULL, /* 4 */
+ NULL, /* 4 */
*repos_id,
root_node_repos_relpath,
root_node_revision,
