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>
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index d066546..eba9635 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -471,6 +471,7 @@
 	struct request rq;
 
 	memset(&rq, 0, sizeof(rq));
+	rq.ref_count = 1;
 	rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 	rq.buffer = buf;