samples: kprobes: Fixes a typo

Fixes typo in a function name.

Link: https://lore.kernel.org/all/20230817170819.77857-1-atulpant.linux@gmail.com/



Signed-off-by: Atul Kumar Pant <atulpant.linux@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>