Make __stringify support variable argument macros too

For example:

__stringify(__entry->irq, __entry->ret)

will now convert it to:

"REC->irq, REC->ret"

It also still supports single arguments as the old macro did.

Signed-off-by: Zhao Lei <[e-mail]>
Acked-by: Frederic Weisbecker <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
LKML-Reference: <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>

include/linux/stringify.h

···
  * converts to "bar".
  */
 
-#define __stringify_1(x)	#x
-#define __stringify(x)		__stringify_1(x)
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
 
 #endif	/* !__LINUX_STRINGIFY_H */