Open master device as late as possible.

tool/CommandSoeWrite.cpp

@@ -80,6 +80,7 @@ string CommandSoeWrite::helpString() const
 
 void CommandSoeWrite::execute(const StringVector &args)
 {
+	MasterIndexList masterIndices;
     stringstream strIdn, err;
     const DataType *dataType = NULL;
     ec_ioctl_slave_soe_write_t ioctl;
@@ -98,11 +99,12 @@ void CommandSoeWrite::execute(const StringVector &args)
         throwInvalidUsageException(err);
     }
 
-    if (getMasterIndices().size() != 1) {
+	masterIndices = getMasterIndices();
+    if (masterIndices.size() != 1) {
         err << getName() << " requires to select a single master!";
         throwInvalidUsageException(err);
     }
-    MasterDevice m(getMasterIndices().front());
+    MasterDevice m(masterIndices.front());
     m.open(MasterDevice::ReadWrite);
     slaves = selectedSlaves(m);
     if (slaves.size() != 1) {