fs/buffer.c: fix use true/false for bool type

Use true/false for bool return type of has_bh_in_lru().

Link: http://lkml.kernel.org/r/20191029040529.GA7625@sauravSigned-off-by: NSaurav Girepunje <saurav.girepunje@gmail.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/buffer.c

@@ -1423,10 +1423,10 @@ static bool has_bh_in_lru(int cpu, void *dummy)
 	
 	for (i = 0; i < BH_LRU_SIZE; i++) {
 		if (b->bhs[i])
-			return 1;
+			return true;
 	}
 
-	return 0;
+	return false;
 }
 
 void invalidate_bh_lrus(void)