initialize sense to keep valgrind happy

valgrind does not know that sense will be initialized by the ioctl
so we need to to it explicitely to keep it from warning us.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

test-tool/iscsi-support.c

@@ -1,4 +1,3 @@
-
 /*
    iscsi-test tool support
 
@@ -200,6 +199,7 @@ static struct scsi_task *send_scsi_command(struct scsi_device *sdev, struct scsi
 		unsigned char sense[sense_len];
 		char buf[1024];
 
+		memset(sense, 0, sizeof(sense));
 		memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
 		io_hdr.interface_id = 'S';