tracing: Fix spelling mistake "preapre" -> "prepare"

There is a spelling mistake in the trace text. Fix it.

Link: https://lkml.kernel.org/r/20220928215828.66325-1-colin.i.king@gmail.com

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>