swresample/swresample: Print used int_sample_fmt

Suggested-by: wm4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/swresample.c

@@ -226,10 +226,10 @@ av_cold int swr_init(struct SwrContext *s){
         }else if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_FLTP){
             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
         }else{
-            av_log(s, AV_LOG_DEBUG, "Using double precision mode\n");
             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
         }
     }
+    av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));
 
     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P