Initialize the SCSI command properly

This fixes Sense Code:              Illegal Request (0x05)
Source:
https://serverfault.com/questions/864580/what-could-cause-a-sense-error-when-setting-lto-encryption

src/scsiencrypt.cpp

@@ -261,6 +261,7 @@ bool SCSIWriteEncryptOptions(string tapeDevice, SCSIEncryptOptions* eOptions){
 	//create the key descriptor
 	if(eOptions->keyName!=""){
 		SSP_KAD kad;
+		memset(&kad,0,sizeof(kad));
 		kad.type=0x00;
 		kad.authenticated=0;
 		//set the descriptor length to the length of the keyName