avfilter/af_sofalizer: switch comments positions to correct order

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/af_sofalizer.c

@@ -154,8 +154,8 @@ static int load_sofa(AVFilterContext *ctx, char *filename, int *samplingrate)
         return AVERROR(EINVAL);
     }
 
-    n_samples = dim_length[n_dim_id]; /* get number of measurements */
-    m_dim     = dim_length[m_dim_id]; /* get length of one IR */
+    n_samples = dim_length[n_dim_id]; /* get length of one IR */
+    m_dim     = dim_length[m_dim_id]; /* get number of measurements */
 
     av_freep(&dim_length);