Fix some compiler warnings.

Mostly about deprecated ASCII casts.

Change-Id: I70428913799c15f20a1a5f80be57848e1072e058
Reviewed-on: http://codereview.qt.nokia.com/4158
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

src/plugins/pulseaudio/qaudioinput_pulse.cpp

@@ -359,7 +359,7 @@ qint64 QPulseAudioInput::read(char *data, qint64 len)
         emit stateChanged(m_deviceState);
     }
 
-    size_t readBytes = 0;
+    int readBytes = 0;
 
     if (!m_pullMode && !m_tempBuffer.isEmpty()) {
         readBytes = qMin(static_cast<int>(len), m_tempBuffer.size());