KeyChainGroupTest: fix spurious test failure of `bloomFilterForMarrie…

…dChains()`

This was caused by expected bloom filter false positives.

This is a backport of c205c67.

core/src/test/java/org/bitcoinj/wallet/KeyChainGroupTest.java

@@ -389,7 +389,10 @@ public void bloomFilterForMarriedChains() throws Exception {
             assertTrue("key " + i, filter.contains(address.getHash()));
         }
         // We ran ahead of the lookahead buffer.
-        assertFalse(filter.contains(group.freshAddress(KeyChain.KeyPurpose.RECEIVE_FUNDS).getHash()));
+        // We try two fresh addresses because of expected false positives. Note that the test could still fail.
+        Address fresh1 = group.freshAddress(KeyPurpose.RECEIVE_FUNDS);
+        Address fresh2 = group.freshAddress(KeyPurpose.RECEIVE_FUNDS);
+        assertFalse(filter.contains(fresh1.getHash()) && filter.contains(fresh2.getHash()));
     }
 
     @Test