QTableGenerator: replace a call to a member function with direct element access

Saves one copy of a vector.

Change-Id: I3a14c46e306c3d44a64c6e0d8cd2f120b2c208d7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp

@@ -442,7 +442,7 @@ void TableGenerator::parseKeySequence(char *line)
 void TableGenerator::printComposeTable() const
 {
 #ifdef DEBUG_GENERATOR
-    if (composeTable().isEmpty())
+    if (m_composeTable.isEmpty())
         return;
 
     QString output;