Release locked buffer when it fails to acquire graphics buffer

The JNI buffer in ImageReader_imageSetup is not released when
it fails to acquire graphics buffer. After all JNI buffers are
exhausted, ACQUIRE_MAX_IMAGES will be returned and leads to
error. The JNI buffer should be released when it fails to acquire
graphics buffer.

Change-Id: I3319a58ac44e36c8593b404672a685c4b589a735