tracing: Use strim() in trigger_process_regex() instead of skip_spaces()

The function trigger_process_regex() is called by a few functions, where
only one calls strim() on the buffer passed to it. That leaves the other
functions not trimming the end of the buffer passed in and making it a
little inconsistent.

Remove the strim() from event_trigger_regex_write() and have
trigger_process_regex() use strim() instead of skip_spaces(). The buff
variable is not passed in as const, so it can be modified.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Link: https://patch.msgid.link/20251125214032.323747707@kernel.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/trace_events_trigger.c

@@ -308,7 +308,8 @@ int trigger_process_regex(struct trace_event_file *file, char *buff)
 	char *command, *next;
 	struct event_command *p;
 
-	next = buff = skip_spaces(buff);
+	next = buff = strim(buff);
+
 	command = strsep(&next, ": \t");
 	if (next) {
 		next = skip_spaces(next);
@@ -345,8 +346,6 @@ static ssize_t event_trigger_regex_write(struct file *file,
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
-	strim(buf);
-
 	guard(mutex)(&event_mutex);
 
 	event_file = event_file_file(file);