[PATCH] Fix get_nodes() mask miscalculation

It appears there is a nodemask miscalculation in the get_nodes() function
in mm/mempolicy.c.  This bug has two effects:

1. It is impossible to specify a length 1 nodemask.
2. It is impossible to specify a nodemask containing the last node.

The following patch has been confirmed to solve both problems.
Signed-off-by: Brent Casavant <bcasavan@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/mempolicy.c

@@ -132,7 +132,6 @@ static int get_nodes(unsigned long *nodes, unsigned long __user *nmask,
 	unsigned long nlongs;
 	unsigned long endmask;
 
-	--maxnode;
 	bitmap_zero(nodes, MAX_NUMNODES);
 	if (maxnode == 0 || !nmask)
 		return 0;