tracing: Make trace_define_field_ext() static

Just after the fix to TASK_COMM_LEN not converted to its value in
 trace_events was pulled, the kernel test robot reported that the helper
 function trace_define_field_ext() added to that change was only used in
 the file it was defined in but was not declared static. Make it a local
 function.
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Merge tag 'trace-v6.2-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing fixlet from Steven Rostedt:
 "Make trace_define_field_ext() static.

  Just after the fix to TASK_COMM_LEN not converted to its value in
  trace_events was pulled, the kernel test robot reported that the
  helper function trace_define_field_ext() added to that change was only
  used in the file it was defined in but was not declared static.

  Make it a local function"

* tag 'trace-v6.2-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing: Make trace_define_field_ext() static

kernel/trace/trace_events.c

@@ -155,7 +155,7 @@ int trace_define_field(struct trace_event_call *call, const char *type,
 }
 EXPORT_SYMBOL_GPL(trace_define_field);
 
-int trace_define_field_ext(struct trace_event_call *call, const char *type,
+static int trace_define_field_ext(struct trace_event_call *call, const char *type,
 		       const char *name, int offset, int size, int is_signed,
 		       int filter_type, int len)
 {