drivers/gpu/drm/radeon: fix a couple of array index errors

[Darren Jenkins <darrenrjenkins@gmail.com>]

There are a couple of array overruns, and some associated confusion in
the code. 
This is just a wild guess at what the code should actually look like.

Coverity CID: 13305 13306

Signed-off-by: Darren Jenkins <darrenrjenkins@gmail.com>
diff --git a/drivers/gpu/drm/radeon/radeon_legacy_tv.c
b/drivers/gpu/drm/radeon/radeon_legacy_tv.c
index 3a12bb0..c37535a 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_tv.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_tv.c
@@ -112,6 +112,8 @@ static const uint16_t vert_timing_NTSC[] = {
 	0x1817,
 	0x21d4,
 	0x0002,
+	0x0000,
+	0x0000,
 	0
 };
 
@@ -623,9 +625,9 @@ void radeon_legacy_tv_mode_set(struct drm_encoder
*encoder,
 	}
 	flicker_removal = (tmp + 500) / 1000;
 
-	if (flicker_removal < 3)
-		flicker_removal = 3;
-	for (i = 0; i < 6; ++i) {
+	if (flicker_removal < 2)
+		flicker_removal = 2;
+	for (i = 0; i < ARRAY_SIZE(SLOPE_limit); ++i) {
 		if (flicker_removal = SLOPE_limit[i])
 			break;
 	}
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h
b/drivers/gpu/drm/radeon/radeon_mode.h
index 3dcbe13..068f6ea 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -217,8 +217,8 @@ struct radeon_mode_info {
 
 };
 
-#define MAX_H_CODE_TIMING_LEN 32
-#define MAX_V_CODE_TIMING_LEN 32
+#define MAX_H_CODE_TIMING_LEN 16
+#define MAX_V_CODE_TIMING_LEN 16
 
 /* need to store these as reading
    back code tables is excessive */