kprobes: Use bool type for functions which returns boolean value

Use the 'bool' type instead of 'int' for the functions which
returns a boolean value, because this makes clear that those
functions don't return any error code.

Link: https://lkml.kernel.org/r/163163041649.489837.17311187321419747536.stgit@devnote2



Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>