In listaddressgroupings push down the IsMine check to run on each input.

This avoids a potential crash when trying to read the scrippubkeys on
transactions where the first input IsMine but some of the rest are not
when running listaddressgroupings.

src/wallet.cpp

@@ -1664,29 +1664,38 @@ set< set<CTxDestination> > CWallet::GetAddressGroupings()
     {
         CWalletTx *pcoin = &walletEntry.second;
 
-        if (pcoin->vin.size() > 0 && IsMine(pcoin->vin[0]))
+        if (pcoin->vin.size() > 0)
         {
+            bool any_mine = false;
             // group all input addresses with each other
             BOOST_FOREACH(CTxIn txin, pcoin->vin)
             {
                 CTxDestination address;
+                if(!IsMine(txin)) /* If this input isn't mine, ignore it */
+                    continue;
                 if(!ExtractDestination(mapWallet[txin.prevout.hash].vout[txin.prevout.n].scriptPubKey, address))
                     continue;
                 grouping.insert(address);
+                any_mine = true;
             }
 
             // group change with input addresses
-            BOOST_FOREACH(CTxOut txout, pcoin->vout)
-                if (IsChange(txout))
-                {
-                    CWalletTx tx = mapWallet[pcoin->vin[0].prevout.hash];
-                    CTxDestination txoutAddr;
-                    if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
-                        continue;
-                    grouping.insert(txoutAddr);
-                }
-            groupings.insert(grouping);
-            grouping.clear();
+            if (any_mine)
+            {
+               BOOST_FOREACH(CTxOut txout, pcoin->vout)
+                   if (IsChange(txout))
+                   {
+                       CTxDestination txoutAddr;
+                       if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
+                           continue;
+                       grouping.insert(txoutAddr);
+                   }
+            }
+            if (grouping.size() > 0)
+            {
+                groupings.insert(grouping);
+                grouping.clear();
+            }
         }
 
         // group lone addrs by themselves