title: Why deleteRecording crashed (AVAudioRecorder, iOS)?
body: <p>[recorder deleteRecording]; works well 30 times, but around 31 it crashes.</p>
  
  <pre><code>0   libobjc.A.dylib                 0x3266fc98 objc_msgSend + 16
  1   Foundation                      0x328c203c -[NSError dealloc] + 36
  2   CoreFoundation                  0x30d2dc3c -[NSObject(NSObject) release] + 24
  3   Foundation                      0x328e687c -[NSFilesystemItemRemoveOperation dealloc] + 36
  4   Foundation                      0x328bc7b2 -[NSOperation release] + 38
  5   CoreFoundation                  0x30d2e19a CFRelease + 62
  6   CoreFoundation                  0x30d30eb4 _CFAutoreleasePoolPop + 140
  7   Foundation                      0x328abbae NSPopAutoreleasePool + 2
  8   Foundation                      0x3293a908 __NSThreadPerformPerform + 620
  9   CoreFoundation                  0x30da0a72 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 6
  10  CoreFoundation                  0x30da2758 __CFRunLoopDoSources0 + 376
  11  CoreFoundation                  0x30da34e4 __CFRunLoopRun + 224
  12  CoreFoundation                  0x30d33ebc CFRunLoopRunSpecific + 224
  13  CoreFoundation                  0x30d33dc4 CFRunLoopRunInMode + 52
  14  GraphicsServices                0x31896418 GSEventRunModal + 108
  15  GraphicsServices                0x318964c4 GSEventRun + 56
  16  UIKit                           0x355b9d62 -[UIApplication _run] + 398
  17  UIKit                           0x355b7800 UIApplicationMain + 664
  18  AppName                         0x000020f6 main (main.m:16)
  19  AppName                         0x00002050 start + 44
  </code></pre>