media: gspca: ov534-ov772x: Fix off-by-one error in set_frame_rate()

commit d2842de upstream.

In set_frame_rate(), select a rate in rate_0 or rate_1 by checking
sd->frame_rate >= r->fps in a loop, but the loop condition terminates when
the index reaches zero, which fails to check the last elememt in rate_0 or
rate_1.

Check for >= 0 so that the last one in rate_0 or rate_1 is also checked.

Fixes: 189d92a ("V4L/DVB (13422): gspca - ov534: ov772x changes from Richard Kaswy.")
Cc: [email protected]
Signed-off-by: Jinjie Ruan <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Jinjie Ruan

drivers/media/usb/gspca/ov534.c

@@ -847,7 +847,7 @@ static void set_frame_rate(struct gspca_dev *gspca_dev)
 		r = rate_1;
 		i = ARRAY_SIZE(rate_1);
 	}
-	while (--i > 0) {
+	while (--i >= 0) {
 		if (sd->frame_rate >= r->fps)
 			break;
 		r++;