mm/rmap: fix coccinelle warnings

mm/rmap.c:851:9-10: WARNING: return of 0/1 in function 'invalid_mkclean_vma' with return type bool

 Return statements in functions returning bool should use
 true/false instead of 1/0.

Generated by: coccinelle/misc/boolreturn.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap.c

@@ -848,9 +848,9 @@ out:
 static bool invalid_mkclean_vma(struct vm_area_struct *vma, void *arg)
 {
 	if (vma->vm_flags & VM_SHARED)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 int page_mkclean(struct page *page)