vf_fieldorder: cosmetics, remove an extra linebreak

libavfilter/vf_fieldorder.c

@@ -35,8 +35,7 @@
 #include "internal.h"
 #include "video.h"
 
-typedef struct
-{
+typedef struct {
     const AVClass *class;
     int dst_tff;               ///< output bff/tff
     int          line_size[4]; ///< bytes of pixel data per line for each plane