s390/ctcm: Convert sprintf/snprintf to scnprintf

This LWN article explains the why scnprintf is preferred over snprintf
in general
https://lwn.net/Articles/69419/
Ie. snprintf() returns what *would* be the resulting length, while
scnprintf() returns the actual length.

Note that ctcm_print_statistics() writes the data into the kernel log
and is therefore not suitable for sysfs_emit(). Observable behavior is
not changed, as there may be dependencies.

Reviewed-by: Alexandra Winter <[email protected]>
Signed-off-by: Thorsten Winkler <[email protected]>
Signed-off-by: Alexandra Winter <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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