Cosmetic (rename detect_repeats to is_atty which matches the truth)

Originally committed as revision 25177 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/log.c

@@ -86,7 +86,7 @@ void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
     static int print_prefix=1;
     static int count;
     static char line[1024], prev[1024];
-    static int detect_repeats;
+    static int is_atty;
     AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
     if(level>av_log_level)
         return;
@@ -107,12 +107,12 @@ void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
     print_prefix= line[strlen(line)-1] == '\n';
 
 #if HAVE_ISATTY
-    if(!detect_repeats) detect_repeats= isatty(2) ? 1 : -1;
+    if(!is_atty) is_atty= isatty(2) ? 1 : -1;
 #endif
 
     if(print_prefix && (flags & AV_LOG_SKIP_REPEATED) && !strcmp(line, prev)){
         count++;
-        if(detect_repeats==1)
+        if(is_atty==1)
         fprintf(stderr, "    Last message repeated %d times\r", count);
         return;
     }