2015-09-04  Roland McGrath  <roland@hack.frob.com>

	[BZ #18921]
	* sysdeps/posix/opendir.c (need_isdir_precheck) [O_DIRECTORY]:
	Fix inverted sense of test of 'o_directory_works' value.
	Reported by Pádraig Brady <P@draigBrady.com>, diagnosed by
	Bernhard Voelker <mail@bernhard-voelker.de>.

Index: glibc-2.22/sysdeps/posix/opendir.c
===================================================================
--- glibc-2.22.orig/sysdeps/posix/opendir.c
+++ glibc-2.22/sysdeps/posix/opendir.c
@@ -105,7 +105,7 @@ need_isdir_precheck (void)
     tryopen_o_directory ();
 
   /* We can skip the expensive `stat' call if O_DIRECTORY works.  */
-  return o_directory_works > 0;
+  return o_directory_works < 0;
 #endif
   return true;
 }