[POWERPC] PS3: Remove duplicate variable assignement

A minor change to remove a duplicate variable assignement in ps3_mm_shutdown();

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/ps3/mm.c

@@ -826,5 +826,4 @@ void __init ps3_mm_init(void)
 void ps3_mm_shutdown(void)
 {
 	ps3_mm_region_destroy(&map.r1);
-	map.total = map.rm.size;
 }