ffmpeg: fix variable type for end char

fixes warning
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg.c

@@ -1496,7 +1496,7 @@ static void print_report(int is_last_report, int64_t timer_start, int64_t cur_ti
     av_bprintf(&buf_script, "drop_frames=%d\n", nb_frames_drop);
 
     if (print_stats || is_last_report) {
-        const char *end = is_last_report ? '\n' : '\r';
+        const char end = is_last_report ? '\n' : '\r';
         if (print_stats==1 && AV_LOG_INFO > av_log_get_level()) {
             fprintf(stderr, "%s    %c", buf, end);
         } else