xfree86: Fix O_CLOEXEC usage in lnx_platform

It was passing O_CLOEXEC as permission bits instead of as a flag.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit ab53e2859f)

hw/xfree86/os-support/linux/lnx_platform.c

@@ -43,7 +43,7 @@ get_drm_info(struct OdevAttributes *attribs, char *path, int delayed_index)
     }
 
     if (fd == -1)
-        fd = open(path, O_RDWR, O_CLOEXEC);
+        fd = open(path, O_RDWR | O_CLOEXEC, 0);
 
     if (fd == -1)
         return FALSE;