Replace unhexlify() calls with unhexlify_str()

Fixes petertodd#274

Author: petertodd

bitcoin/rpc.py

@@ -589,7 +589,7 @@ def getrawtransaction(self, txid, verbose=False, block_hash=None):
             raise IndexError('%s.getrawtransaction(): %s (%d)' %
                     (self.__class__.__name__, ex.error['message'], ex.error['code']))
         if verbose:
-            r['tx'] = CTransaction.deserialize(unhexlify(r['hex']))
+            r['tx'] = CTransaction.deserialize(unhexlify_str(r['hex']))
             del r['hex']
             del r['txid']
             del r['version']
@@ -598,7 +598,7 @@ def getrawtransaction(self, txid, verbose=False, block_hash=None):
             del r['vout']
             r['blockhash'] = lx(r['blockhash']) if 'blockhash' in r else None
         else:
-            r = CTransaction.deserialize(unhexlify(r))
+            r = CTransaction.deserialize(unhexlify_str(r))
         return r
 
     def getreceivedbyaddress(self, addr, minconf=1):