init/epoll: Switch to aggregate initialization

Make it easier to verify for humans that all data structure members are
initialized. No functionality is changed.

Bug: 213617178
Change-Id: I1ce2af566dba51f2032f2e7518576a67e666d12e
Signed-off-by: Bart Van Assche <bvanassche@google.com>

init/epoll.cpp

@@ -45,16 +45,18 @@ Result<void> Epoll::RegisterHandler(int fd, Handler handler, uint32_t events) {
         return Error() << "Must specify events";
     }
 
-    Info info;
-    info.events = events;
-    info.handler = std::make_shared<decltype(handler)>(std::move(handler));
-    auto [it, inserted] = epoll_handlers_.emplace(fd, std::move(info));
+    auto [it, inserted] = epoll_handlers_.emplace(
+            fd, Info{
+                        .events = events,
+                        .handler = std::make_shared<Handler>(std::move(handler)),
+                });
     if (!inserted) {
         return Error() << "Cannot specify two epoll handlers for a given FD";
     }
-    epoll_event ev;
-    ev.events = events;
-    ev.data.fd = fd;
+    epoll_event ev = {
+            .events = events,
+            .data.fd = fd,
+    };
     if (epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) == -1) {
         Result<void> result = ErrnoError() << "epoll_ctl failed to add fd";
         epoll_handlers_.erase(fd);