global/signal_handler: fix typo

and use list initializer to init an array

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 8b14914)

src/global/signal_handler.cc

@@ -179,25 +179,22 @@ struct SignalHandler : public Thread {
   };
 
   /// all handlers
-  safe_handler *handlers[32];
+  safe_handler *handlers[32] = {nullptr};
 
   /// to protect the handlers array
   Mutex lock;
 
   SignalHandler()
     : stop(false), lock("SignalHandler::lock")
   {
-    for (unsigned i = 0; i < 32; i++)
-      handlers[i] = NULL;
-
     // create signal pipe
     int r = pipe(pipefd);
     assert(r == 0);
     r = fcntl(pipefd[0], F_SETFL, O_NONBLOCK);
     assert(r == 0);
 
     // create thread
-    create("sginal_handler");
+    create("signal_handler");
   }
 
   ~SignalHandler() {