Squashed commit of the changes from the mobile-examples repository

(4.7-generated-declarative branch).
(cherry picked from commit 539311f7b2687e3148ea695ce06fee768abe7b44)

examples/multimedia/audiodevices/audiodevices.cpp

@@ -47,7 +47,7 @@
 
 QString toString(QAudioFormat::SampleType sampleType)
 {
-    QString result("Unknown");
+    QString result;
     switch (sampleType) {
     case QAudioFormat::SignedInt:
         result = "SignedInt";
@@ -58,7 +58,9 @@ QString toString(QAudioFormat::SampleType sampleType)
     case QAudioFormat::Float:
         result = "Float";
         break;
+    default:
     case QAudioFormat::Unknown:
+        result = "Unknown";
         break;
     }
     return result;