tracing/function-profiler: do not free per cpu variable stat

The per cpu variable stat is freeded if we fail to allocate a name
on start up. This was due to stat at first being allocated in the
initial design. But since then, it has become a static per cpu variable
but the free on error was not removed.

Also added __init annotation to the function that this is in.

[ Impact: prevent possible memory corruption on low mem at boot up ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>