msg/async/EventSelect.h: init max_fd in ctor

Fix for:

CID 1254381 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
 uninit_member: Non-static class member max_fd is not initialized
 in this constructor nor in any functions that it calls.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

Author: dalgaaf

src/msg/async/EventSelect.h

@@ -31,7 +31,7 @@ class SelectDriver : public EventDriver {
   CephContext *cct;
 
  public:
-  SelectDriver(CephContext *c): cct(c) {}
+  SelectDriver(CephContext *c): max_fd(0), cct(c) {}
   virtual ~SelectDriver() {}
 
   int init(int nevent);