Keep pool name also for pool-fast

It's cheap to keep this name - and it is useful for 'non pool debug code'
compilation.

libdm/mm/pool-fast.c

@@ -28,6 +28,7 @@ struct dm_pool {
 	struct dm_list list;
 	struct chunk *chunk, *spare_chunk;	/* spare_chunk is a one entry free
 						   list to stop 'bobbling' */
+	const char *name;
 	size_t chunk_size;
 	size_t object_len;
 	unsigned object_alignment;
@@ -51,6 +52,7 @@ struct dm_pool *dm_pool_create(const char *name, size_t chunk_hint)
 		return 0;
 	}
 
+	p->name = name;
 	/* round chunk_hint up to the next power of 2 */
 	p->chunk_size = chunk_hint + sizeof(struct chunk);
 	while (new_size < p->chunk_size)

libdm/mm/pool.c

@@ -71,7 +71,7 @@ void dm_pools_check_leaks(void)
 			  p->orig_pool,
 			  p->name, p->stats.bytes);
 #else
-		log_error(" [%p]", p);
+		log_error(" [%p] %s", p, p->name);
 #endif
 	}
 }