buffer: remove ssh_buffer_get_begin()

Note that removing ssh_buffer_get_begin() doesn't break API
compatibility, as this functions has never been exposed (it only
has the LIBSSH_API prefix).

Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/buffer.c

@@ -434,23 +434,6 @@ int ssh_buffer_add_buffer(struct ssh_buffer_struct *buffer,
     return 0;
 }
 
-/**
- * @brief Get a pointer on the head of a buffer.
- *
- * @param[in]  buffer   The buffer to get the head pointer.
- *
- * @return              A data pointer on the head. It doesn't take the position
- *                      into account.
- *
- * @warning Don't expect data to be nul-terminated.
- *
- * @see ssh_buffer_get()
- * @see ssh_buffer_get_len()
- */
-void *ssh_buffer_get_begin(struct ssh_buffer_struct *buffer){
-  return buffer->data;
-}
-
 /**
  * @internal
  *