Fix of struct field name.

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 4761fbc..892c42e 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -96,8 +96,8 @@
     ngx_buf_t             stsc_data_buf;
     ngx_buf_t             stsz_atom_buf;
     ngx_buf_t             stsz_data_buf;
-    ngx_buf_t             tsco_atom_buf;
-    ngx_buf_t             tsco_data_buf;
+    ngx_buf_t             stco_atom_buf;
+    ngx_buf_t             stco_data_buf;
 
     ngx_mp4_stsc_entry_t  stsc_chunk_entry;
 } ngx_http_mp4_trak_t;
@@ -2552,12 +2552,12 @@
     trak = ngx_mp4_last_trak(mp4);
     trak->chunks = entries;
 
-    atom = &trak->tsco_atom_buf;
+    atom = &trak->stco_atom_buf;
     atom->temporary = 1;
     atom->pos = atom_header;
     atom->last = atom_table;
 
-    data = &trak->tsco_data_buf;
+    data = &trak->stco_data_buf;
     data->temporary = 1;
     data->pos = atom_table;
     data->last = atom_end;