MT#59962 DSMCoreModule: move instead of copy

Fixes:
     Variable copied when it could be moved (COPY_INSTEAD_OF_MOVE)
     copy_constructor_call: varname is passed-by-value as parameter
     to std::__cxx11::basic_string<char, std::char_traits<char>,
     std::allocator<char> >::basic_string(std::__cxx11::basic_string<char, std::char_traits<char>,
     std::allocator<char> > const &), when it could be moved instead.

Do the move operation also for the rvalue beign assigned,
as it is a locally allocated pair.

Change-Id: Iba8e349f13c4f83bcd10e229fb101e7b26872f0e

apps/dsm/DSMCoreModule.cpp

@@ -1402,7 +1402,7 @@ EXEC_ACTION_START(SCDIAction) {
 	
 	string varname = lb->first.substr(varprefix.length());
 	if (varname.find(".") == string::npos)
-	  var_struct[varname] = lb->second;
+	  var_struct[std::move(varname)] = lb->second;
 	else
 	  string2argarray(varname, lb->second, var_struct);