lavfi/deshake: remove unecessary check before unref.

diff --git a/libavfilter/vf_deshake.c b/libavfilter/vf_deshake.c
index 5c562eb2b4fa4da50076485e1eb14e7d503e8170..68d72673ae96655a9d23012c9737e0e6cb62491d 100644 (file)
--- a/libavfilter/vf_deshake.c
+++ b/libavfilter/vf_deshake.c
@@ -530,8 +530,7 @@ static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in)
 
     // Store the current frame as the reference frame for calculating the
     // motion of the next frame
-    if (deshake->ref != NULL)
-        avfilter_unref_buffer(deshake->ref);
+    avfilter_unref_buffer(deshake->ref);
 
     // Cleanup the old reference frame
     deshake->ref = in;