alsalayer : reduce indentation

sflphone-common/src/audio/alsa/alsalayer.cpp

@@ -1014,17 +1014,21 @@ void AlsaLayer::audioCallback (void)
 
     SFLDataFormat* in = NULL;
 
-    if (is_capture_running()) {
+    if (!is_capture_running())
+        return;
 
     micAvailBytes = snd_pcm_avail_update (_CaptureHandle);
 
-        if (micAvailBytes > 0) {
+    if (micAvailBytes < 0)
+        _debug ("Audio: Mic error: %s", snd_strerror (micAvailBytes));
+    if (micAvailBytes <= 0)
+        return;
+    
     micAvailPut = getMainBuffer()->availForPut();
     toPut = (micAvailBytes <= framesPerBufferAlsa) ? micAvailBytes : framesPerBufferAlsa;
     in = (SFLDataFormat*) malloc (toPut * sizeof (SFLDataFormat));
     toPut = read (in, toPut* sizeof (SFLDataFormat));
 
-            if (in) {
     adjustVolume (in, toPut, SFL_PCM_CAPTURE);
 
     int _mainBufferSampleRate = getMainBuffer()->getInternalSamplingRate();
@@ -1055,14 +1059,8 @@ void AlsaLayer::audioCallback (void)
             free (filter_out);
         }
     }
-            }
 
     free (in);
-            in=0;
-        } else if (micAvailBytes < 0) {
-            _debug ("Audio: Mic error: %s", snd_strerror (micAvailBytes));
-        }
-    }
 }
 
 void* AlsaLayer::adjustVolume (void* buffer , int len, int stream)