internal->sub_range is unsigned, a negative won't get noticed.

Signed-off-by: Roel Kluin <roel.kl...@gmail.com>
---
diff --git a/drivers/media/dvb/frontends/stb0899_algo.c 
b/drivers/media/dvb/frontends/stb0899_algo.c
index 83dc7e1..2ea32da 100644
--- a/drivers/media/dvb/frontends/stb0899_algo.c
+++ b/drivers/media/dvb/frontends/stb0899_algo.c
@@ -464,13 +464,14 @@ static void next_sub_range(struct stb0899_state *state)
 
        if (internal->sub_dir > 0) {
                old_sub_range = internal->sub_range;
-               internal->sub_range = MIN((internal->srch_range / 2) -
+               if (internal->tuner_offst + internal->sub_range / 2 >=
+                               internal->srch_range / 2)
+                       internal->sub_range = 0;
+               else
+                       internal->sub_range = MIN((internal->srch_range / 2) -
                                          (internal->tuner_offst + 
internal->sub_range / 2),
                                           internal->sub_range);
 
-               if (internal->sub_range < 0)
-                       internal->sub_range = 0;
-
                internal->tuner_offst += (old_sub_range + internal->sub_range) 
/ 2;
        }
 
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