mm: fix comments for mmap_init()

mmap_init() is no longer associated with VMA slab.  So fix it.

Link: http://lkml.kernel.org/r/1485182601-9294-1-git-send-email-iamyooon@gmail.comSigned-off-by: seokhoon.yoon <iamyooon@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/mmap.c

@@ -3446,7 +3446,7 @@ void mm_drop_all_locks(struct mm_struct *mm)
 }
 
 /*
- * initialise the VMA slab
+ * initialise the percpu counter for VM
  */
 void __init mmap_init(void)
 {

mm/nommu.c

@@ -517,7 +517,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 }
 
 /*
- * initialise the VMA and region record slabs
+ * initialise the percpu counter for VM and region record slabs
  */
 void __init mmap_init(void)
 {