libata: Remove FIXME comment in atapi_request_sense()

Remove the FIXME comment in atapi_request_sense() asking whether
memset of sense buffer is necessary.  The buffer may be partially or
fully filled by the device.  We want it to be cleared.

tj: Updated description.
Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/libata-scsi.c

@@ -2595,7 +2595,6 @@ static void atapi_request_sense(struct ata_queued_cmd *qc)
 
 	DPRINTK("ATAPI request sense\n");
 
-	/* FIXME: is this needed? */
 	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 
 #ifdef CONFIG_ATA_SFF