lavfi/f_ebur128: replace pow(10,x) by ff_exp10(x)

Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

libavfilter/f_ebur128.c

@@ -435,7 +435,7 @@ static int config_audio_output(AVFilterLink *outlink)
     return 0;
 }
 
-#define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.))
+#define ENERGY(loudness) (ff_exp10(((loudness) + 0.691) / 10.))
 #define LOUDNESS(energy) (-0.691 + 10 * log10(energy))
 #define DBFS(energy) (20 * log10(energy))