might work

iguana/dpow/dpow_fsm.c

@@ -623,20 +623,21 @@ void dpow_statemachinestart(void *ptr)
     // unlock the dest utxo on KMD.
     if ( (strcmp("KMD",dest->symbol) == 0 ) && (ep->dest.prev_vout != -1) )
     {
-      destunlockunspent = dpow_unlockunspent(myinfo,bp->destcoin,destaddr,bits256_str(str2,ep->dest.prev_hash),ep->dest.prev_vout);
-      printf("destlockunspent: %s\n", destunlockunspent);
-      if (strcmp(destunlockunspent,"true") == 0 )
-        printf(">>>>UNLOCKED %s UTXO.(%s) vout.(%d)\n",dest->symbol,bits256_str(str2,ep->dest.prev_hash),ep->dest.prev_vout);
-      free(destunlockunspent);
+      if ( destunlockunspent = dpow_unlockunspent(myinfo,bp->destcoin,destaddr,bits256_str(str2,ep->dest.prev_hash),ep->dest.prev_vout) != 0 ) {
+        if (strcmp(destunlockunspent,"true") == 0 )
+          printf(">>>>UNLOCKED %s UTXO.(%s) vout.(%d)\n",dest->symbol,bits256_str(str2,ep->dest.prev_hash),ep->dest.prev_vout);
+        free(destunlockunspent);
+      }
     }
 
     // unlock the src selected utxo on KMD, as those are the only ones we LOCK, and CHIPS does not like the lockunspent call.
     if ( ( strcmp("KMD",src->symbol) == 0 ) && (ep->src.prev_vout != -1) )
     {
-      srcunlockunspent = dpow_unlockunspent(myinfo,bp->srccoin,srcaddr,bits256_str(str2,ep->src.prev_hash),ep->src.prev_vout);
-      if (strcmp(srcunlockunspent,"true") == 0 )
-        printf(">>>>UNLOCKED %s UTXO.(%s) vout.(%d)\n",src->symbol,bits256_str(str2,ep->src.prev_hash),ep->src.prev_vout);
-      free(srcunlockunspent);
+      if ( srcunlockunspent = dpow_unlockunspent(myinfo,bp->srccoin,srcaddr,bits256_str(str2,ep->src.prev_hash),ep->src.prev_vout) != 0) {
+        if (strcmp(srcunlockunspent,"true") == 0 )
+          printf(">>>>UNLOCKED %s UTXO.(%s) vout.(%d)\n",src->symbol,bits256_str(str2,ep->src.prev_hash),ep->src.prev_vout);
+        free(srcunlockunspent);
+      }
     }
 
     // dp->blocks[bp->height] = 0;