#864 Event cast cleanup for compilation warnings

[wild-boar]

I ran into a minor problem with the declaration of events. Declared with a #define, a compiler warning emerges which requires -fpermissive to clear. I noticed chEvtObjectInit() uses a different cast "event_listerner_t " versus "void ".

This patch against trunk removes the compiler warning and also makes both ways to initialize the object consistent.

Index: os/rt/include/chevents.h
===================================================================
--- os/rt/include/chevents.h    (revision 10325)
+++ os/rt/include/chevents.h    (working copy)
@@ -102,7 +102,7 @@
  *          source that is part of a bigger structure.
  * @param name          the name of the event source variable
  */
-#define _EVENTSOURCE_DATA(name) {(void *)(&name)}
+#define _EVENTSOURCE_DATA(name) {(event_listener_t *)(&name)}

 /**
  * @brief   Static event source initializer.

[Giovanni Di Sirio]

Fixed in trunk, 17.6.1 and 16.1.9.

Thanks,
Giovanni