tracing/trivial: Add missing comma in TRACE_EVENT comment

Add missing comma within the TRACE_EVENT() example in tracepoint.h.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20110106184532.GA2526@Krystal>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Ingo Molnar <mingo@elte.hu>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/linux/tracepoint.h

@@ -326,7 +326,7 @@ do_trace:								\
  *		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
  *		__entry->next_pid	= next->pid;
  *		__entry->next_prio	= next->prio;
- *	)
+ *	),
  *
  *	*
  *	* Formatted output of a trace record via TP_printk().