[PATCH -next] media: meson: vdec: Add missing kthread.h

[YueHaibing]

Fix building error:

drivers/staging/media/meson/vdec/vdec.c: In function vdec_recycle_thread:
drivers/staging/media/meson/vdec/vdec.c:59:10: error: implicit declaration
 of function kthread_should_stop;
 did you mean thread_saved_sp? [-Werror=implicit-function-declaration]

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 3e7f51bd9607 ("media: meson: add v4l2 m2m video decoder driver")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/staging/media/meson/vdec/vdec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c
index 4e4f9d6..0a1a04f 100644
--- a/drivers/staging/media/meson/vdec/vdec.c
+++ b/drivers/staging/media/meson/vdec/vdec.c
@@ -12,6 +12,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
+#include <linux/kthread.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-ctrls.h>
-- 
2.7.4