Allow sending of file transfer requests with length 0 but don't allocate

any file number for them in core.

These can be used to tell friends we don't have an avatar set or to unset
a set avatar.

1 files changed, 4 insertions, 0 deletions

diff --git a/auto_tests/tox_test.c b/auto_tests/tox_test.c
index 29b91bb2..66193035 100644
--- a/auto_tests/tox_test.c
+++ b/auto_tests/tox_test.c
@@ -202,6 +202,10 @@ void tox_file_chunk_request(Tox *tox, uint32_t friend_number, uint32_t file_numb
     }
 
     if (length == 0) {
+        if (file_sending_done) {
+            ck_abort_msg("File sending already done.");
+        }
+
         file_sending_done = 1;
         return;
     }