Fix standalone polling loop

Not explicitely checking for POLLIN leads to breakage. Unbreak saned.

ChangeLog

@@ -1,3 +1,6 @@
+2009-12-24  Julien Blache <jb@jblache.org>
+	* frontend/saned.c: fix a bug in the standalone polling code.
+
 2009-12-05  Stéphane Voltz <stef.dev at free.fr>
 	* backend/genesys.c backend/genesys_gl841.c backend/genesys_low.h:
 	fixed amount of bytes left to read at document end for gl841 based

frontend/saned.c

@@ -3120,6 +3120,8 @@ run_standalone (int argc, char **argv)
 
 	      break;
 	    }
+	  else if (! (fdp->revents & POLLIN))
+	    continue;
 
 	  fd = accept (fdp->fd, 0, 0);
 	  if (fd < 0)