avfilter/af_astats: replace FFABS with fabs

libavfilter/af_astats.c

@@ -163,9 +163,9 @@ static inline void update_stat(AudioStatsContext *s, ChannelStats *p, double d)
     p->sigma_x += d;
     p->sigma_x2 += d * d;
     p->avg_sigma_x2 = p->avg_sigma_x2 * s->mult + (1.0 - s->mult) * d * d;
-    p->min_diff = FFMIN(p->min_diff == -1 ? DBL_MAX : p->min_diff, FFABS(d - (p->min_diff == -1 ? DBL_MAX : p->last)));
-    p->max_diff = FFMAX(p->max_diff, FFABS(d - (p->max_diff == -1 ? d : p->last)));
-    p->diff1_sum += FFABS(d - p->last);
+    p->min_diff = FFMIN(p->min_diff == -1 ? DBL_MAX : p->min_diff, fabs(d - (p->min_diff == -1 ? DBL_MAX : p->last)));
+    p->max_diff = FFMAX(p->max_diff, fabs(d - (p->max_diff == -1 ? d : p->last)));
+    p->diff1_sum += fabs(d - p->last);
     p->last = d;
     p->mask |= llrint(d * (UINT64_C(1) << 63));