scsi: sd: Make sd_revalidate_disk() return void

scsi: sd: Make sd_revalidate_disk() return void

The sd_revalidate_disk() function currently returns 0 for both success
and memory allocation failure. Since none of its callers use the return
value, this return code is both unnecessary and potentially misleading.

Change the return type of sd_revalidate_disk() from int to void
and remove all return value handling. This makes the function
semantics clearer and avoids confusion about unused return codes.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Abinash Singh <abinashsinghlalotra@gmail.com>
Link: https://lore.kernel.org/r/20250825183940.13211-4-abinashsinghlalotra@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>