issue with devstat_buildmatch(3) and certain strings

[Alexander Best]

hi there,

devstat_buildmatch(3) crashes with certain strings. you can test this by
doing one of:

iostat -t ","
iostat -t ",,"
iostat -t "da,"
iostat -t ",da,"
iostat -t ",da"
iostat -t "da,scsi,"
iostat -t ",da,scsi"
iostat -t "da,,scsi"

i've tried, but wasn't able to fix this properly.

cheers.
alex

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a13x