usb: chipidea: tracing: Use the new __vstring() helper

Instead of open coding a __dynamic_array() with a fixed length (which
defeats the purpose of the dynamic array in the first place). Use the new
__vstring() helper that will use a va_list and only write enough of the
string into the ring buffer that is needed.

Link: https://lkml.kernel.org/r/[e-mail]

Cc: Peter Chen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: [e-mail]
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

drivers/usb/chipidea/trace.h

···
 	TP_ARGS(ci, vaf),
 	TP_STRUCT__entry(
 		__string(name, dev_name(ci->dev))
-		__dynamic_array(char, msg, CHIPIDEA_MSG_MAX)
+		__vstring(msg, vaf->fmt, vaf->va)
 	),
 	TP_fast_assign(
 		__assign_str(name, dev_name(ci->dev));
-		vsnprintf(__get_str(msg), CHIPIDEA_MSG_MAX, vaf->fmt, *vaf->va);
+		__assign_vstr(msg, vaf->fmt, vaf->va);
 	),
 	TP_printk("%s: %s", __get_str(name), __get_str(msg))
 );