* exceptions.cc (sigframe::call_signal_handler): Return value of

call_signal_handler_now.
* sigproc.h (sigframe): Use constructor.
* syscalls.cc (_read): Correct errno test prior to calling signal handler.

winsup/cygwin/sigproc.h

@@ -71,7 +71,7 @@ public:
       t.get_winapi_lock ();
   }
 
-  sigframe () {st = NULL;}
+  sigframe (): st (NULL) {}
   sigframe (sigthread &t, DWORD ebp = (DWORD) __builtin_frame_address (0))
   {
     if (!t.frame && t.id == GetCurrentThreadId ())