avoid OPEN_MAX in SCM_MAX_FD

The OPEN_MAX constant is an arbitrary number with no useful relation to
anything. Nothing should be using it. SCM_MAX_FD is just an arbitrary
constant and it should be clear that its value is chosen in net/scm.h
and not actually derived from anything else meaningful in the system.

Signed-off-by: Roland McGrath <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/net/scm.h

···
 /* Well, we should have at least one descriptor open
  * to accept passed FDs 8)
  */
-#define SCM_MAX_FD	(OPEN_MAX-1)
+#define SCM_MAX_FD	255
 
 struct scm_fp_list
 {