mm: drop unneeded pgdat argument from free_area_init_node()

free_area_init_node() gets passed in the node id as well as the node
descriptor.  This is redundant as the function can trivially get the node
descriptor itself by means of NODE_DATA() and the node's id.

I checked all the users and NODE_DATA() seems to be usable everywhere
from where this function is called.

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/m68k/mm/sun3mmu.c

@@ -94,7 +94,7 @@ void __init paging_init(void)
 
 	/* I really wish I knew why the following change made things better...  -- Sam */
 /*	free_area_init(zones_size); */
-	free_area_init_node(0, NODE_DATA(0), zones_size,
+	free_area_init_node(0, zones_size,
 			    (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);