Debugger: Remove some debugging code

Avoids a possibly large temporary string.

Change-Id: Ic20cccedc35df0172c3586054f098e2c0f4b69c2
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/debugger/debuggerprotocol.cpp

@@ -254,7 +254,6 @@ void GdbMi::parseTuple_helper(DebuggerOutputParser &parser)
 {
     parser.skipCommas();
     //qDebug() << "parseTuple_helper: " << parser.buffer();
-    QString buf = parser.buffer();
     m_type = Tuple;
     while (!parser.isAtEnd()) {
         if (parser.isCurrent('}')) {