avcodec/mpegaudio_tablegen: remove dead branch

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegaudio_tablegen.h

@@ -63,7 +63,7 @@ static void mpegaudio_tableinit(void)
             /* cbrtf() isn't available on all systems, so we use powf(). */
             double f = (double)value * pow(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR;
             /* llrint() isn't always available, so round and cast manually. */
-            expval_table_fixed[exponent][value] = (long long int) (f >= 0 ? floor(f + 0.5) : ceil(f - 0.5));
+            expval_table_fixed[exponent][value] = (long long int) floor(f + 0.5);
             expval_table_float[exponent][value] = f;
         }
         exp_table_fixed[exponent] = expval_table_fixed[exponent][1];