ide: add missing rq.ref_count initialization to ide_diag_taskfile()

Noticed by Tejun Heo.

Cc: Tejun Heo <htejun@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-taskfile.c

@@ -471,6 +471,7 @@ static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long
 	struct request rq;
 
 	memset(&rq, 0, sizeof(rq));
+	rq.ref_count = 1;
 	rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 	rq.buffer = buf;