Explicitely check for errors on fds

Previous code checked for no activity (!POLLIN) and would error out with
2 fds and only one active.

ChangeLog

@@ -1,3 +1,7 @@
+2009-08-08 Julien Blache <jb@jblache.org>
+	- frontend/saned.c: run_standalone(), explicitely check for errors
+	on fds.
+
 2009-08-07 m. allan noah <kitno455 at gmail dot com>
 	* backend/fujitsu.[ch], backend/fujitsu-scsi.h: Backend v96
 	- split sane_get_parameters into two functions

frontend/saned.c

@@ -3106,7 +3106,7 @@ run_standalone (int argc, char **argv)
       for (i = 0, fdp = fds; i < nfds; i++, fdp++)
 	{
 	  /* Error on an fd */
-	  if (! (fdp->revents & POLLIN))
+	  if (fdp->revents & (POLLERR | POLLHUP | POLLNVAL))
 	    {
 	      for (i = 0, fdp = fds; i < nfds; i++, fdp++)
 		close (fdp->fd);