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mtx: change MTX_UNOWNED from 4 to 0

Description

mtx: change MTX_UNOWNED from 4 to 0

The value is spread all over the kernel and zeroing a register is
cheaper/shorter than setting it up to an arbitrary value.

Reduces amd64 GENERIC-NODEBUG .text size by 0.4%.

MFC after: 1 week

Details

Provenance
mjgAuthored on
Parents
rS324608: Regenerate usb.conf
Branches
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