tests: Make feature_block pass on centos

Author: MarcoFalke

test/functional/feature_block.py

@@ -824,7 +824,7 @@ def run_test(self):
         tx.vin.append(CTxIn(COutPoint(b64a.vtx[1].sha256, 0)))
         b64a = self.update_block("64a", [tx])
         assert_equal(len(b64a.serialize()), MAX_BLOCK_BASE_SIZE + 8)
-        self.sync_blocks([b64a], success=False, reject_reason='non-canonical ReadCompactSize():')
+        self.sync_blocks([b64a], success=False, reject_reason='non-canonical ReadCompactSize()')
 
         # bitcoind doesn't disconnect us for sending a bloated block, but if we subsequently
         # resend the header message, it won't send us the getdata message again. Just