s390/dasd: Remove unnecessary errorstring generation

In quite a few cases an errorstring is generated using snprintf() before
it's passed to dev_err(). This indirection is unnecessary and all
information can simply be passed directly to dev_err() instead.
The errrorstring and ERRORLENGTH definitions are removed entirely.

While at it, rephrase the error messages to provide more context where
possible. Also, fix a few incorrectly used format specifier (e.g. %x02
-> %02x) in those messages.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20240208164248.540985-4-sth@linux.ibm.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>