git: Adjust for the removal of callout_stop_sync().

[Sascha Wildner]

commit ac392440fc56f1b52c866ba9a191e4cf8bc4bef8
Author: Sascha Wildner <saw at online.de>
Date:   Fri Mar 29 17:23:48 2019 +0100

    Adjust for the removal of callout_stop_sync().
    
    * Remove the manual page via 'make upgrade'.
    
    * Update porting_drivers.txt

Summary of changes:
 Makefile_upgrade.inc    | 1 +
 doc/porting_drivers.txt | 2 --
 2 files changed, 1 insertion(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/ac392440fc56f1b52c866ba9a191e4cf8bc4bef8


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