Cleanup: Remove fil_space_t::is_deferred()

The public data member can be checked directly by the only caller.

extra/mariabackup/fil_cur.cc

@@ -420,7 +420,7 @@ xb_fil_cur_result_t xb_fil_cur_read(xb_fil_cur_t*	cursor,
 		goto func_exit;
 	}
 
-	defer = space->is_deferred();
+	defer = UT_LIST_GET_FIRST(space->chain)->deferred;
 	/* check pages for corruption and re-read if necessary. i.e. in case of
 	partially written pages */
 	for (page = cursor->buf, i = 0; i < npages;

storage/innobase/include/fil0fil.h

@@ -510,10 +510,6 @@ struct fil_space_t final
   /** @return whether the storage device is rotational (HDD, not SSD) */
   inline bool is_rotational() const;
 
-  /** whether the tablespace discovery is being deferred during crash
-  recovery due to incompletely written page 0 */
-  inline bool is_deferred() const;
-
   /** Open each file. Never invoked on .ibd files.
   @param create_new_db    whether to skip the call to fil_node_t::read_page0()
   @return whether all files were opened */
@@ -1191,11 +1187,6 @@ inline bool fil_space_t::is_rotational() const
   return false;
 }
 
-inline bool fil_space_t::is_deferred() const
-{
-  return UT_LIST_GET_FIRST(chain)->deferred;
-}
-
 /** Common InnoDB file extensions */
 enum ib_extention {
 	NO_EXT = 0,