Check return code from open()

src/dnsmasq.c

@@ -561,11 +561,14 @@ int main (int argc, char **argv)
      {       
        /* open  stdout etc to /dev/null */
        int nullfd = open("/dev/null", O_RDWR);
+       if (nullfd != -1)
+	 {
 	   dup2(nullfd, STDOUT_FILENO);
 	   dup2(nullfd, STDERR_FILENO);
 	   dup2(nullfd, STDIN_FILENO);
 	   close(nullfd);
 	 }
+     }
    
    /* if we are to run scripts, we need to fork a helper before dropping root. */
   daemon->helperfd = -1;