tracing: Remove redundant 0 value initialization

The saved_cmdlines_buffer struct is already zeroed by memset(). It's
redundant to initialize s->cmdline_idx to 0.

Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Liao Yuanhong <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: Liao Yuanhong

kernel/trace/trace_sched_switch.c

@@ -224,7 +224,6 @@ static struct saved_cmdlines_buffer *allocate_cmdlines_buffer(unsigned int val)
 	/* Place map_cmdline_to_pid array right after saved_cmdlines */
 	s->map_cmdline_to_pid = (unsigned *)&s->saved_cmdlines[val * TASK_COMM_LEN];
 
-	s->cmdline_idx = 0;
 	memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP,
 	       sizeof(s->map_pid_to_cmdline));
 	memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP,