Added double quotes to variables of three `rm` commands

alsa-project/alsa-utils pull request #210 was opened from wileyhy:

lines 73, 80 and 98

Request URL : https://github.com/alsa-project/alsa-utils/pull/210 Patch URL : https://github.com/alsa-project/alsa-utils/pull/210.patch Repository URL: https://github.com/alsa-project/alsa-utils