Extra check for type is unnecessary in first case.

Extra zeroing is unnecessary, as snprintf guarantees that it will
zero-terminate string.
Acked-by: NSong Liu <songliubraving@fb.com>
Signed-off-by: NAndrii Nakryiko <andriin@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>