tracing: Trivia spelling fix containerof() -> container_of()

This is the only location on kernel that has wrong spelling
of the container_of() helper. Fix it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>