tracing: Rename ftrace_data_offset_##call to trace_event_data_offset_##call

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The structure ftrace_data_offset_##call is
used to find the offsets of dynamically allocated fields in trace_events.
It has nothing to do with function tracing. Rename it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/trace/perf.h

@@ -11,7 +11,7 @@
  * {
  *	struct trace_event_file *trace_file = __data;
  *	struct trace_event_call *event_call = trace_file->event_call;
- *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
+ *	struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
  *	unsigned long eflags = trace_file->flags;
  *	enum event_trigger_type __tt = ETT_NONE;
  *	struct ring_buffer_event *event;
@@ -154,7 +154,7 @@ static notrace void							\
 trace_event_raw_event_##call(void *__data, proto)			\
 {									\
 	struct trace_event_file *trace_file = __data;			\
-	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+	struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 	struct trace_event_buffer fbuffer;				\
 	struct trace_event_raw_##call *entry;				\
 	int __data_size;						\
@@ -293,7 +293,7 @@ static notrace void							\
 perf_trace_##call(void *__data, proto)					\
 {									\
 	struct trace_event_call *event_call = __data;			\
-	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+	struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 	struct trace_event_raw_##call *entry;				\
 	struct pt_regs *__regs;						\
 	u64 __addr = 0, __count = 1;					\

include/trace/trace_events.h

@@ -138,7 +138,7 @@ TRACE_MAKE_SYSTEM_STR();
  *
  * Include the following:
  *
- * struct ftrace_data_offsets_<call> {
+ * struct trace_event_data_offsets_<call> {
  *	u32				<item1>;
  *	u32				<item2>;
  *	[...]
@@ -178,7 +178,7 @@ TRACE_MAKE_SYSTEM_STR();
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-	struct ftrace_data_offsets_##call {				\
+	struct trace_event_data_offsets_##call {			\
 		tstruct;						\
 	};
 
@@ -486,7 +486,7 @@ ftrace_define_fields_##call(struct trace_event_call *event_call)	\
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 static inline notrace int ftrace_get_offsets_##call(			\
-	struct ftrace_data_offsets_##call *__data_offsets, proto)       \
+	struct trace_event_data_offsets_##call *__data_offsets, proto)	\
 {									\
 	int __data_size = 0;						\
 	int __maybe_unused __item_length;				\