tracing: Switch trace_events.c code over to use guard()

There are several functions in trace_events.c that have "goto out;" or
equivalent on error in order to release locks that were taken. This can be
error prone or just simply make the code more complex.

Switch every location that ends with unlocking a mutex on error over to
using the guard(mutex)() infrastructure to let the compiler worry about
releasing locks. This makes the code easier to read and understand.

Some locations did some simple arithmetic after releasing the lock. As
this causes no real overhead for holding a mutex while processing the file
position (*ppos += cnt;) let the lock be held over this logic too.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/20241219201345.522546095@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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