typo fixed

libethcore/Common.h

@@ -101,7 +101,7 @@ enum class ImportResult
 	Success = 0,
 	UnknownParent,
 	FutureTimeKnown,
-	FutureTimeUnkwnown,
+	FutureTimeUnknown,
 	AlreadyInChain,
 	AlreadyKnown,
 	Malformed,

libethereum/BlockChainSync.cpp

@@ -186,7 +186,7 @@ void BlockChainSync::onPeerBlocks(EthereumPeer* _peer, RLP const& _r)
 				got++;
 				break;
 
-			case ImportResult::FutureTimeUnkwnown:
+			case ImportResult::FutureTimeUnknown:
 				future++; //Fall through
 
 			case ImportResult::UnknownParent:
@@ -270,7 +270,7 @@ void BlockChainSync::onPeerNewBlock(EthereumPeer* _peer, RLP const& _r)
 		case ImportResult::AlreadyKnown:
 			break;
 
-		case ImportResult::FutureTimeUnkwnown:
+		case ImportResult::FutureTimeUnknown:
 		case ImportResult::UnknownParent:
 			clog(NetMessageSummary) << "Received block with no known parent. Resyncing...";
 			resetSyncFor(_peer, h, _r[1].toInt<u256>());

libethereum/BlockQueue.cpp

@@ -233,7 +233,7 @@ ImportResult BlockQueue::import(bytesConstRef _block, BlockChain const& _bc, boo
 		m_unknownCount++;
 		m_difficulty += bi.difficulty;
 		bool unknown =  !m_readySet.count(bi.parentHash) && !m_drainingSet.count(bi.parentHash) && !_bc.isKnown(bi.parentHash);
-		return unknown ? ImportResult::FutureTimeUnkwnown : ImportResult::FutureTimeKnown;
+		return unknown ? ImportResult::FutureTimeUnknown : ImportResult::FutureTimeKnown;
 	}
 	else
 	{