db lib: db wrapper for free() should return void, not void *

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@45867 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/db/dbmi_base/alloc.c

@@ -108,7 +108,7 @@ void *db_realloc(void *s, int n)
   
   \param s pointer to memory to be freed
 */
-void *db_free(void *s)
+void db_free(void *s)
 {
     free(s);
 }