mm/mm_init.c: remove the outdated code comment above deferred_grow_zone()

The noinline attribute has been taken off in commit 9420f89d ("mm:
move most of core MM initialization to mm/mm_init.c").  So remove the
unneeded code comment above deferred_grow_zone().

And also remove the unneeded bracket in deferred_init_pages().

Link: https://lkml.kernel.org/r/20240326061134.1055295-6-bhe@redhat.comSigned-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/mm_init.c

@@ -2014,7 +2014,7 @@ static unsigned long  __init deferred_init_pages(struct zone *zone,
 		__init_single_page(page, pfn, zid, nid);
 		nr_pages++;
 	}
-	return (nr_pages);
+	return nr_pages;
 }
 
 /*
@@ -2216,10 +2216,6 @@ static int __init deferred_init_memmap(void *data)
  * Return true when zone was grown, otherwise return false. We return true even
  * when we grow less than requested, to let the caller decide if there are
  * enough pages to satisfy the allocation.
- *
- * Note: We use noinline because this function is needed only during boot, and
- * it is called from a __ref function _deferred_grow_zone. This way we are
- * making sure that it is not inlined into permanent text section.
  */
 bool __init deferred_grow_zone(struct zone *zone, unsigned int order)
 {