Use map to simplify structure of setup a bit
Use map to simplify structure of setup a bit

This eliminates the method-level identifiers buf_loc_1 and buf_loc_2.
The names still appear here and there, but now they are bound locally,
in various match arms, and not globally within the method.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd