media: stv0299: use time_is_before_jiffies() instead of open coding it

Use the helper function time_is_{before,after}_jiffies() to improve
code readability.
Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/dvb-frontends/stv0299.c

@@ -183,7 +183,7 @@ static int stv0299_wait_diseqc_fifo (struct stv0299_state* state, int timeout)
 	dprintk ("%s\n", __func__);
 
 	while (stv0299_readreg(state, 0x0a) & 1) {
-		if (jiffies - start > timeout) {
+		if (time_is_before_jiffies(start + timeout)) {
 			dprintk ("%s: timeout!!\n", __func__);
 			return -ETIMEDOUT;
 		}
@@ -200,7 +200,7 @@ static int stv0299_wait_diseqc_idle (struct stv0299_state* state, int timeout)
 	dprintk ("%s\n", __func__);
 
 	while ((stv0299_readreg(state, 0x0a) & 3) != 2 ) {
-		if (jiffies - start > timeout) {
+		if (time_is_before_jiffies(start + timeout)) {
 			dprintk ("%s: timeout!!\n", __func__);
 			return -ETIMEDOUT;
 		}