mm/memory.c: suppress warning

gcc-4.4.4 screws this up.

  mm/memory.c: In function 'do_pmd_numa_page':
  mm/memory.c:3594: warning: no return statement in function returning non-void

Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/memory.c

@@ -3590,6 +3590,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		     unsigned long addr, pmd_t *pmdp)
 {
 	BUG();
+	return 0;
 }
 #endif /* CONFIG_NUMA_BALANCING */