CDRIVER-487: Missing entry calls

Closes #142

Author: bjori

src/mongoc/mongoc-cursor.c

@@ -321,10 +321,10 @@ _mongoc_cursor_new (mongoc_client_t           *client,
 void
 mongoc_cursor_destroy (mongoc_cursor_t *cursor)
 {
-   BSON_ASSERT(cursor);
-
    ENTRY;
 
+   BSON_ASSERT(cursor);
+
    if (cursor->iface.destroy) {
       cursor->iface.destroy(cursor);
    } else {
@@ -685,6 +685,8 @@ mongoc_cursor_error (mongoc_cursor_t *cursor,
 {
    bool ret;
 
+   ENTRY;
+
    BSON_ASSERT(cursor);
 
    if (cursor->iface.error) {