Quieten 'getdata' P2P message output

Output one message per getdata, not one message per 'inv' entry.

src/main.cpp

@@ -2575,10 +2575,14 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             return error("message getdata size() = %d", vInv.size());
         }
 
+        if (fDebugNet || (vInv.size() != 1))
+            printf("received getdata (%d invsz)\n", vInv.size());
+
         BOOST_FOREACH(const CInv& inv, vInv)
         {
             if (fShutdown)
                 return true;
+            if (fDebugNet || (vInv.size() == 1))
                 printf("received getdata for: %s\n", inv.ToString().c_str());
 
             if (inv.type == MSG_BLOCK)