database, ...: remove EINTR checks after stdio calls

MPD doesn't have child processes anymore, and thus we're not expecting
to receive SIGCHLD very often.  Since hard disk access isn't
interrupted by signals anyway, we don't need those excessive checks.

src/sig_handlers.c

@@ -66,7 +66,7 @@ void initSigHandlers(void)
 	sa.sa_flags = 0;
 	sigemptyset(&sa.sa_mask);
 	sa.sa_handler = SIG_IGN;
-	while (sigaction(SIGPIPE, &sa, NULL) < 0 && errno == EINTR) ;
+	x_sigaction(SIGPIPE, &sa);
 
 	sa.sa_handler = exit_signal_handler;
 	x_sigaction(SIGINT, &sa);