Typo fix in aplay.c

[GitHub pull_request - opened <github@xxxxxxxxxxxxxxxx>]

alsa-project/alsa-utils pull request #43 was opened from trebmuh:

HTH

Request URL   : https://github.com/alsa-project/alsa-utils/pull/43
Patch URL     : https://github.com/alsa-project/alsa-utils/pull/43.patch
Repository URL: https://github.com/alsa-project/alsa-utils