Avoid warning on empty expressions

For some reason, Q_UNUSED includes already a semicolon, adding one
on the user side creates an additional empty statement.

Change-Id: I9c5e8fac381345a60792cb75e2938fd53958d3b0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/texteditor/textindenter.cpp

@@ -51,7 +51,7 @@ void TextIndenter::indentBlock(const QTextBlock &block,
                                const TabSettings &tabSettings,
                                int /*cursorPositionInEditor*/)
 {
-    Q_UNUSED(typedChar);
+    Q_UNUSED(typedChar)
     const int indent = indentFor(block, tabSettings);
     if (indent < 0)
         return;