avfilter/af_biquads: Remove l from %lf in av_log environment

The l modifier does nothing in C99 and it was undefined in C89 for %f
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/af_biquads.c

@@ -383,7 +383,7 @@ static int config_filter(AVFilterLink *outlink, int reset)
         av_assert0(0);
     }
 
-    av_log(ctx, AV_LOG_VERBOSE, "a=%lf %lf %lf:b=%lf %lf %lf\n", s->a0, s->a1, s->a2, s->b0, s->b1, s->b2);
+    av_log(ctx, AV_LOG_VERBOSE, "a=%f %f %f:b=%f %f %f\n", s->a0, s->a1, s->a2, s->b0, s->b1, s->b2);
 
     s->a1 /= s->a0;
     s->a2 /= s->a0;