lib/subordinateio.c: get_owner_id(): Use snprintf_() instead of its pattern

[alejandro-colomar]

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Revisions:

v1b

• Rebase

$ git range-diff alx/master..gh/snprintf_ master..snprintf_ 
1:  6a656139 = 1:  99aef5b4 lib/subordinateio.c: get_owner_id(): Use snprintf_() instead of its pattern

v1c

• Rebase

$ git range-diff alx/master..gh/snprintf_ master..snprintf_ 
1:  99aef5b4 = 1:  1fad167c lib/subordinateio.c: get_owner_id(): Use snprintf_() instead of its pattern

v1d

• Rebase

$ git range-diff master..gh/snprintf_ shadow/master..snprintf_ 
1:  1fad167c = 1:  242ba524 lib/subordinateio.c: get_owner_id(): Use snprintf_() instead of its pattern