(ITS#8502) mdb_cursor_count() == EINVAL for empty DB

[h . b . furuseth]

Full_Name: Hallvard B Furuseth
Version: mdb.master, 26e226b2a8cdba4208eabca394537900c4eda3b3
OS: 
URL: 
Submission from: (NULL) (81.191.45.31)
Submitted by: hallvard


mdb_cursor_count() has code to return MDB_NOTFOUND if !mc_snum,
but it comes after if (! ... C_INITIALIZED) return EINVAL.