markers: add missing stdargs.h include, needed due to va_list usage

Impact: build fix (for future changes)

That seemed to cause built issue when marker.h is included early, even
though stdargs.h is included in kernel.h.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/marker.h b/include/linux/marker.h
index 4cf4547..05ec0df 100644
--- a/include/linux/marker.h
+++ b/include/linux/marker.h
@@ -12,6 +12,7 @@
  * See the file COPYING for more details.
  */
 
+#include <stdarg.h>
 #include <linux/types.h>
 
 struct module;