• Fix volume control for TPB by correcting typing error:

replace wrong "dec.acpi_ibm.0.volume" with right "dev.acpi_ibm.0.volume"

• assign submitter as maintainer for this unmaintained port
• bump PORTREVISION.

PR: 220900
Submitted by: Dmitry Luhtionov
Approved by: az (mentor)
MFH: 2017Q3