doc/examples: remove unneeded NULL checks

dst_file cannot be NULL
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/examples/resampling_audio.c

@@ -199,7 +199,6 @@ int main(int argc, char **argv)
             fmt, dst_ch_layout, dst_nb_channels, dst_rate, dst_filename);
 
 end:
-    if (dst_file)
     fclose(dst_file);
 
     if (src_data)

doc/examples/scaling_video.c

@@ -132,7 +132,6 @@ int main(int argc, char **argv)
            av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h, dst_filename);
 
 end:
-    if (dst_file)
     fclose(dst_file);
     av_freep(&src_data[0]);
     av_freep(&dst_data[0]);