ftrace: Fix trace header alignment

Line up helper arrows to the right column.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
[bigeasy: fixup function tracer header]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>