core.event: pass (event, evtyoe) to callback instead of (event, fd, evtype)

fd is available as event.fd

gevent/core.pyx

@@ -108,7 +108,7 @@ EV_PERSIST = 0x10
 cdef void __event_handler(int fd, short evtype, void *arg) with gil:
     cdef event ev = <event>arg
     try:
-        ev._callback(ev, fd, evtype)
+        ev._callback(ev, evtype)
     except:
         traceback.print_exc()
         try:

gevent/greenlet.py

@@ -227,7 +227,7 @@ class DispatchExit(Exception):
     pass
 
 
-def _wait_helper(ev, fd, evtype):
+def _wait_helper(ev, evtype):
     current, timeout_exc = ev.arg
     if evtype & core.EV_TIMEOUT:
         current.throw(timeout_exc)

gevent/select.py

@@ -18,7 +18,7 @@ def select(read_list, write_list, error_list, t=None):
     assert hub.greenlet is not current, 'do not call blocking functions from the mainloop'
     allevents = []
 
-    def callback(ev, fd, evtype):
+    def callback(ev, evtype):
         if evtype & core.EV_READ:
             current.switch(([ev.arg], [], []))
         elif evtype & core.EV_WRITE: