trace: initcall: Ordered comparison of function pointers

Using initcall_t in the __field macro generates the follwing warning with clang version 6.0:

include/trace/events/initcall.h:34:3: warning: ordered comparison of function pointers ('initcall_t' (aka 'int (*)(void)') and 'initcall_t')

__field macro expands to __field_ext macro which does is_signed_type check on the type argument. Since initcall_t is defined as a function pointer, using it as the type in the __field macro, leads to an ordered comparison of function pointer warning, inside the check. Using __field_struct macro avoids the issue.

---
 include/trace/events/initcall.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 8d6cf10..46f5f7c 100644
@@ -31,7 +31,7 @@
 	TP_ARGS(func),
 
 	TP_STRUCT__entry(
-		__field(initcall_t, func)
+		__field_struct(initcall_t, func)
 	),
 
 	TP_fast_assign(

@@ -48,7 +48,7 @@
 	TP_ARGS(func, ret),
 
 	TP_STRUCT__entry(
-		__field(initcall_t,	func)
+		__field_struct(initcall_t,	func)
 		__field(int,		ret)
 	),
 

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