ring-buffer: Removed unnecessary if() goto out where out is the next line

ring-buffer: Removed unnecessary if() goto out where out is the next line

In the function ring_buffer_discard_commit() there's an if statement that
jumps to the next line:

	if (rb_try_to_discard(cpu_buffer, event))
		goto out;
 out:

This was caused by the change that modified the way timestamps were taken
in interrupt context, and removed the code between the if statement and
the goto, but failed to update the conditional logic.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250527155116.227f35be@gandalf.local.home
Fixes: a389d86f7fd0 ("ring-buffer: Have nested events still record running time stamp")
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>