Correct wrong lower limit and condition used in APE decoder

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@15396 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/apedec.c

@@ -358,11 +358,10 @@ static inline int range_get_symbol(APEContext * ctx,
 
 static inline void update_rice(APERice *rice, int x)
 {
+    int lim = rice->k ? (1 << (rice->k + 4)) : 0;
     rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5);
 
-    if (rice->k == 0)
-        rice->k = 1;
-    else if (rice->ksum < (1 << (rice->k + 4)))
+    if (rice->ksum < lim)
         rice->k--;
     else if (rice->ksum >= (1 << (rice->k + 5)))
         rice->k++;