partitions/ibm: Remove unnecessary memset

The data holding the volume label information is zeroed in case no valid
volume label was found. Since the label information isn't used in that
case, zeroing the data doesn't provide any value whatsoever.

Remove the unnecessary memset() call accordingly.

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/20230915131001.697070-2-sth@linux.ibm.com


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