notify: initialize variable to keep valgrind from bitching

We don't really care what that variable is, so it might as
well be uninitialized, but valgrind does...

git-svn-id: https://svn.musicpd.org/mpd/trunk@7220 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/notify.c

@@ -40,7 +40,7 @@ void waitNotify(Notify *notify)
 
 void signalNotify(Notify *notify)
 {
-	char buffer;
+	char buffer = 0;
 
 	if (write(notify->fds[1], &buffer, sizeof(buffer)) < 0 &&
 	    errno != EAGAIN && errno != EINTR)