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limit range checking code for L[k] to CONFIG_DEBUG. patch by timeless@gmail.com

--- a/vp8/decoder/decodemv.c

+++ b/vp8/decoder/decodemv.c

@@ -226,13 +226,14 @@

                         int mv_contz;

                         while (j != L[++k])

-                            if (k >= 16)

+                        {

 #if CONFIG_DEBUG

+                            if (k >= 16)

+                            {

                                 assert(0);

-

-#else

-                                ;

+                            }

 #endif

+                        }

                         mv_contz = vp8_mv_cont(&(vp8_left_bmi(mi, k)->mv.as_mv), &(vp8_above_bmi(mi, k, mis)->mv.as_mv));