usb: atm: Remove snprintf() from sysfs call-backs and replace with sysfs_emit()

Since snprintf() has the documented, but still rather strange trait of
returning the length of the data that *would have been* written to the
array if space were available, rather than the arguably more useful
length of data *actually* written, it is usually considered wise to use
something else instead in order to avoid confusion.

In the case of sysfs call-backs, new wrappers exist that do just that.

This patch replaces the 2 uses of snprintf() found in the sysfs .show()
call-backs with the new sysfs_emit() helpers.  Whist we're at it, let's
replace the sprintf()s as well.  For no other reason than consistency.

Link: https://lwn.net/Articles/69419/
Link: https://github.com/KSPP/linux/issues/105
Cc: Matthieu CASTET <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Damien Bergamini <[email protected]>
Cc: [email protected]
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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