core/tun.c: Fix documentation in ret of osmo_tundev_send

Change-Id: Id66f77774ed36593201fd5c54a1b29cc7651772b
---
M src/core/tun.c
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/tun.c b/src/core/tun.c
index 8612819..ec68a96 100644
--- a/src/core/tun.c
+++ b/src/core/tun.c
@@ -556,7 +556,7 @@
 /*! Submit a packet to the tunnel device managed by the tundev object
  *  \param[in] tundev The tundev object owning the tunnel device where to inject the packet
  *  \param[in] msg The msgb containg the packet to transfer
- *  \returns The current value of the configured network namespace
+ *  \returns 0 on success; negative on error
  *
  * This function takes the ownership of msg in all cases.
  */

