percpu: remove has_reserved from pcpu_chunk

Prior this variable was used to manage statistics when the first chunk
had a reserved region. The previous patch introduced start_offset to
keep track of the offset by value rather than boolean. Therefore,
has_reserved can be removed.

Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

mm/percpu-stats.c

@@ -58,7 +58,7 @@ static void chunk_map_stats(struct seq_file *m, struct pcpu_chunk *chunk,
 	int cur_min_alloc = 0, cur_med_alloc = 0, cur_max_alloc = 0;
 
 	alloc_sizes = buffer;
-	s_index = chunk->has_reserved ? 1 : 0;
+	s_index = (chunk->start_offset) ? 1 : 0;
 
 	/* find last allocation */
 	last_alloc = -1;