libxdp: Fix xdp prog memory leak in xsk_setup_xdp_prog

In the xsk_setup_xdp_prog function, the xsk structure
temporarily takes ownership of an xdp_prog and stores it in
ctx->xdp_prog. However, the allocated memory is not freed
in xsk_destroy_xsk_struct, leading to a memory leak. This
commit addresses the issue by adding a call to
xdp_program_close to properly release the allocated
xdp_prog memory.

Signed-off-by: Ric Li <[email protected]>

lib/libxdp/xsk.c

@@ -978,6 +978,7 @@ static struct xsk_ctx *xsk_create_ctx(struct xsk_socket *xsk,
 
 static void xsk_destroy_xsk_struct(struct xsk_socket *xsk)
 {
+	xdp_program__close(xsk->ctx->xdp_prog);
 	free(xsk->ctx);
 	free(xsk);
 }