Checkpatch errors that should be downgraded

[David Howells <dhowells@redhat.com>]

In the trace headers, the following should probably be ignored:

	CHECK: Lines should not end with a '('
	#73: FILE: include/trace/events/rxrpc.h:1947:
	+	    TP_STRUCT__entry(

	CHECK: Lines should not end with a '('
	#80: FILE: include/trace/events/rxrpc.h:1954:
	+	    TP_fast_assign(

as it's standard practice to bump the contents onto the next line for these
two macros.

Also checkpatch is wrong in giving this error:

	ERROR: Macros with complex values should be enclosed in parentheses
	#37: FILE: include/trace/events/rxrpc.h:425:
	+#define rxrpc_sack_traces \
	+	EM(rxrpc_sack_advance,			"ADV")	\
	+	EM(rxrpc_sack_fill,			"FIL")	\
	+	EM(rxrpc_sack_nack,			"NAK")	\
	+	EM(rxrpc_sack_none,			"---")	\
	+	E_(rxrpc_sack_oos,			"OOS")

as the contents, when found in a trace header, are going to be used to
generate a string table and maybe an enum.  It's standard practice, so if it
could be ignored in trace headers or at least downgraded to a warning?

Thanks,
David