tracing/trivial: Fix typos and make an int into a bool

Fix up a few typos in comments and convert an int into a bool in
update_traceon_count().

Link: http://lkml.kernel.org/r/546DD445.5080108@hitachi.com

Suggested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index fa0f36b..588af40 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1119,7 +1119,7 @@
 
 /*
  * This is used by __kernel_text_address() to return true if the
- * the address is on a dynamically allocated trampoline that would
+ * address is on a dynamically allocated trampoline that would
  * not return true for either core_kernel_text() or
  * is_module_text_address().
  */