PCI: Use scnprintf(), not snprintf(), in sysfs "show" functions

Sysfs "show" methods should return the number of bytes printed into the
buffer.  This is the return value of scnprintf() [1].

snprintf(buf, size, ...) prints at most "size" bytes into "buf", but
returns the number of bytes that *would* be printed if "buf" were large
enough.

Replace use of snprintf() with scnprintf().  No functional change intended.

Related:
  https://patchwork.kernel.org/patch/9946759/#20969333
  https://lwn.net/Articles/69419

[1] Documentation/filesystems/sysfs.rst

[bhelgaas: squashed, commit log]
Suggested-by: Bjorn Helgaas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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