g723_1dec: remove dead code that leaked in from libav

It appears someone thinks this special case can be reached
Well, it cannot, thus not only do we not need to optimize it
we dont need it at all
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/g723_1.c

@@ -259,12 +259,8 @@ static int scale_vector(int16_t *dst, const int16_t *vector, int length)
 
     bits  = normalize_bits(max, 15);
 
-    if (bits == 15)
-        for (i = 0; i < length; i++)
-            dst[i] = vector[i] * 0x7fff >> 3;
-    else
-        for (i = 0; i < length; i++)
-            dst[i] = vector[i] << bits >> 3;
+    for (i = 0; i < length; i++)
+        dst[i] = vector[i] << bits >> 3;
 
     return bits - 3;
 }