ffmpeg: fix ffmpeg.h trailing whitespace

How this passed through the commit hook?
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Marton Balint <cus@passwd.hu>

ffmpeg.h

@@ -274,7 +274,7 @@ typedef struct InputStream {
     int           wrap_correction_done;
 
     int64_t filter_in_rescale_delta_last;
-    
+
     int64_t min_pts; /* pts with the smallest value in a current stream */
     int64_t max_pts; /* pts with the higher value in a current stream */
     int64_t nb_samples; /* number of samples in the last decoded audio frame before looping */
@@ -353,7 +353,7 @@ typedef struct InputFile {
                              at the moment when looping happens */
     AVRational time_base; /* time base of the duration */
     int64_t input_ts_offset;
-    
+
     int64_t ts_offset;
     int64_t last_ts;
     int64_t start_time;   /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */