hi,

attached patch should fix this regression.

On Wed, Jan 06, 2021 at 11:08:05PM +0100, Michael Ablassmeier wrote:
>  > commit 73cb8f355479d8f7cb402ca967b137d4a32c8f76
>  > Author: FUJITA Tomonori <tomof@acm.org>
>  > Date:   Fri Jul 28 11:34:15 2017 +0900
>  >     smc: fix snprintf warnings with gcc7
> 
> i reverted both commits and removed -WAll from the makefile to be
> able to compile, and now mtx show the barcodes:
> 
>  >  Storage Changer /dev/sg8:1 Drives, 8 Slots ( 0 Import/Export )
>  >  Data Transfer Element 0:Empty
>  >        Storage Element 1:Full :VolumeTag=TAPE001                        
>  >        Storage Element 2:Full :VolumeTag=TAPE002  
> 
> 
> bye,
>     - michael