ac3enc: make sym_quant() branch-free

libavcodec/ac3enc.c

@@ -1096,17 +1096,7 @@ static int compute_bit_allocation(AC3EncodeContext *s)
  */
 static inline int sym_quant(int c, int e, int levels)
 {
-    int v;
-
-    if (c >= 0) {
-        v = (levels * (c << e)) >> 24;
-        v = (v + 1) >> 1;
-        v = (levels >> 1) + v;
-    } else {
-        v = (levels * ((-c) << e)) >> 24;
-        v = (v + 1) >> 1;
-        v = (levels >> 1) - v;
-    }
+    int v = ((((levels * c) >> (24 - e)) + 1) >> 1) + (levels >> 1);
     av_assert2(v >= 0 && v < levels);
     return v;
 }