Merge patch series "'part name' subcommand and some robustification"

Rasmus Villemoes <ravi@prevas.dk> says:

Implement a "part name" subcommand, mirroring the existing "part
number" subcommand.

In the discussion for v1 of that, it came up that there's a bit of
inconsistency in how much and what one can assume to be initialized in
'struct disk_partition' after a successful call of one of the
get_info* family of functions. Patch 1/2 tries to consolidate
that by making sure all ->get_info invocations go through a common
helper that at least always initializes the string members.

Quentin, I've taken the liberty of including your Acks, as the
incremental diff in patch 1 is quite minor, but do speak up if I
should not have done that.

Link: https://lore.kernel.org/r/20251110205411.4075351-1-ravi@prevas.dk