ffserver: move decl to start of func

Signed-off-by: Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>

ffserver.c

@@ -316,12 +316,12 @@ static char *ctime1(char *buf2, int buf_size)
 static void http_vlog(const char *fmt, va_list vargs)
 {
     static int print_prefix = 1;
+    char buf[32];
 
     if (!logfile)
         return;
 
     if (print_prefix) {
-        char buf[32];
         ctime1(buf, sizeof(buf));
         fprintf(logfile, "%s ", buf);
     }