Fix buffer re-use on short streaming

http_h264.c

@@ -32,10 +32,12 @@ void http_video(http_worker_t *worker, FILE *stream)
   int counter = 0;
   fprintf(stream, VIDEO_HEADER);
 
+  buffer_lock_use(&http_h264, 1);
+
   while (!feof(stream)) {
     buffer_t *buf = buffer_lock_get(&http_h264, 3, &counter);
     if (!buf) {
-      return;
+      goto error;
     }
 
     if (buf->v4l2_buffer.flags & V4L2_BUF_FLAG_KEYFRAME) {
@@ -51,4 +53,7 @@ void http_video(http_worker_t *worker, FILE *stream)
     }
     buffer_consumed(buf);
   }
+
+error:
+  buffer_lock_use(&http_h264, -1);
 }