Fixed qaudioinput unit test with pulseaudio backend

- notify signal wasn't being emitted enough.
- range checking on processedUSecs extended.

Change-Id: Icfa1f3b364a7e0f9d3f37abd8dc5ed0c1e22f923
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/pulseaudio/qaudioinput_pulse.cpp

@@ -513,6 +513,12 @@ qint64 QPulseAudioInput::read(char *data, qint64 len)
 
         if (!m_pullMode && readBytes >= len)
             break;
+
+        if (m_intervalTime && (m_timeStamp.elapsed() + m_elapsedTimeOffset) > m_intervalTime) {
+            emit notify();
+            m_elapsedTimeOffset = m_timeStamp.elapsed() + m_elapsedTimeOffset - m_intervalTime;
+            m_timeStamp.restart();
+        }
     }
 
 #ifdef DEBUG_PULSE