s390/zcrypt: utilize dev_set_name() ability to use a formatted string

With the dev_set_name() prototype it's not obvious that it takes
a formatted string as a parameter. Use its facility instead of
duplicating the same with strncpy()/snprintf() calls.

With this, also prevent return error code to be shadowed.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Harald Freudenberger <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

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