Using fabsf for floating value instead of abs

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit f1cfcbfd8f76d4197f66802944e926f848d8dfaf)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/visualization/visual/effects.c

@@ -962,8 +962,8 @@ static int vuMeter_Run(visual_effect_t * p_effect, vlc_object_t *p_aout,
         p_sample += p_effect->i_nb_chans;
     }
 
-    i_value_l = abs(i_value_l);
-    i_value_r = abs(i_value_r);
+    i_value_l = fabsf(i_value_l);
+    i_value_r = fabsf(i_value_r);
 
     /* Stay under maximum value admited */
     if ( i_value_l > 200 * M_PI_2 )