tracing: Get rid of unneeded key calculation in ftrace_hash_move()

It's not used anywhere in the function.

Link: http://lkml.kernel.org/r/1365553093-10180-1-git-send-email-namhyung@kernel.org



Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>