Fix of error message.

src/http/modules/ngx_http_mp4_module.c

diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index ec4aee7..4136da7 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -2488,7 +2488,7 @@
 
     if (trak->start_chunk > trak->chunks) {
         ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
-                      "start time is out mp4 stsc chunks in \"%\"",
+                      "start time is out mp4 stco chunks in \"%\"",
                       mp4->file.name.data);
         return NGX_ERROR;
     }