fftools/cmdutils: Inline print_error()

It is only used by ffprobe (once) and ffplay (twice);
inlining it avoids including it unnecessarily into ffmpeg.

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

fftools/cmdutils.c

@@ -895,11 +895,6 @@ do {                                                                           \
     return 0;
 }
 
-void print_error(const char *filename, int err)
-{
-    av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, av_err2str(err));
-}
-
 int read_yesno(void)
 {
     int c = getchar();