tracing: Have trace_buffer_unlock_commit() call the _regs version with NULL

There's no real difference between trace_buffer_unlock_commit() and
trace_buffer_unlock_commit_regs() except that the former passes NULL to
ftrace_stack_trace() instead of regs. Have the former be a static inline of
the latter which passes NULL for regs.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

@@ -1686,17 +1686,6 @@ __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *eve
 	ring_buffer_unlock_commit(buffer, event);
 }
 
-void trace_buffer_unlock_commit(struct trace_array *tr,
-				struct ring_buffer *buffer,
-				struct ring_buffer_event *event,
-				unsigned long flags, int pc)
-{
-	__buffer_unlock_commit(buffer, event);
-
-	ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL);
-	ftrace_trace_userstack(buffer, flags, pc);
-}
-
 static struct ring_buffer *temp_buffer;
 
 struct ring_buffer_event *

kernel/trace/trace.h

@@ -1069,15 +1069,20 @@ extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
 				     struct ring_buffer *buffer,
 				     struct ring_buffer_event *event);
 
-void trace_buffer_unlock_commit(struct trace_array *tr,
-				struct ring_buffer *buffer,
-				struct ring_buffer_event *event,
-				unsigned long flags, int pc);
 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
 				     struct ring_buffer *buffer,
 				     struct ring_buffer_event *event,
 				     unsigned long flags, int pc,
 				     struct pt_regs *regs);
+
+static inline void trace_buffer_unlock_commit(struct trace_array *tr,
+					      struct ring_buffer *buffer,
+					      struct ring_buffer_event *event,
+					      unsigned long flags, int pc)
+{
+	trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
+}
+
 /*
  * Helper function for event_trigger_unlock_commit{_regs}().
  * If there are event triggers attached to this event that requires