Initialize sigaction.sa_mask to an empty set in a few places we forgot to

src/sig_handlers.c

@@ -125,6 +125,7 @@ void masterInitSigHandlers() {
 	struct sigaction sa;
 
 	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
 	sa.sa_handler = SIG_IGN;
 	while(sigaction(SIGPIPE,&sa,NULL)<0 && errno==EINTR);
 	sa.sa_handler = masterChldSigHandler;
@@ -141,6 +142,7 @@ void initSigHandlers() {
 	struct sigaction sa;
 
 	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
 	sa.sa_handler = SIG_IGN;
 	while(sigaction(SIGPIPE,&sa,NULL)<0 && errno==EINTR);
 	sa.sa_handler = chldSigHandler;
@@ -165,6 +167,7 @@ void setSigHandlersForDecoder() {
 	finishSigHandlers();
 
 	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
 	sa.sa_handler = SIG_IGN;
 	while(sigaction(SIGHUP,&sa,NULL)<0 && errno==EINTR);
 	while(sigaction(SIGINT,&sa,NULL)<0 && errno==EINTR);

src/signal_check.c

@@ -33,6 +33,7 @@ static void __set_signal_handler(int sig, void (* handler)(int))
 {
         struct sigaction act;
         act.sa_flags = 0;
+        sigemptyset(&act.sa_mask);
         act.sa_handler = handler;
         while(sigaction(sig, &act, NULL) && errno==EINTR);
 }