[gnome-db] GnomeDbCombo parameter mismatch

[Jon Willeke <willeke users sourceforge net>]

I'm getting the following warnings building libgnomedb 1.0.2:

WARNING: Parameter description missing in source code comment block -
         Func: gnome_db_combo_set_model Param: pos.
WARNING: Parameter described in source code comment block but does not exist -
         Func: gnome_db_combo_set_model Param: col.

gnome-db-combo.h uses the name pos, whereas gnome-db-combo.c uses col.