arecord command stop when output file set /dev/null

alsa-project/alsa-utils issue #48 was opened from garyfcg:

How to reproduce it? 1. Input the below command, then record go on arecord -r 96000 -c 4 -f S32_LE 1> /dev/null

2. Wait for some minutes, it depended on system memory size. For example,system memory had 2G, (2*1024*1024*1024)/(96k*4*32/8)=1400s

The results: 1. this command quit auto.

Expect: 1. This command should not be interrupted.

Issue URL : https://github.com/alsa-project/alsa-utils/issues/48 Repository URL: https://github.com/alsa-project/alsa-utils