Minor miner fixes (hey hey it's fun to say)

* Fix UpdateCoins() definition in main.h
* Remove pwalletMain reference from BitcoinMiner(), as it is passed
  a wallet argument.

src/main.cpp

@@ -4681,7 +4681,7 @@ void static BitcoinMiner(CWallet *pwallet)
                     assert(hash == pblock->GetHash());
 
                     SetThreadPriority(THREAD_PRIORITY_NORMAL);
-                    CheckWork(pblock, *pwalletMain, reservekey);
+                    CheckWork(pblock, *pwallet, reservekey);
                     SetThreadPriority(THREAD_PRIORITY_LOWEST);
 
                     // In regression test mode, stop mining after a block is found. This

src/main.h

@@ -318,7 +318,7 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, CCoinsViewCach
                  std::vector<CScriptCheck> *pvChecks = NULL);
 
 // Apply the effects of this transaction on the UTXO set represented by view
-bool UpdateCoins(const CTransaction& tx, CCoinsViewCache &view, CTxUndo &txundo, int nHeight, const uint256 &txhash);
+void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, CTxUndo &txundo, int nHeight, const uint256 &txhash);
 
 // Context-independent validity checks
 bool CheckTransaction(const CTransaction& tx, CValidationState& state);