utsname.h: make new_utsname fields use the proper length constant

The members of the new_utsname structure are defined with magic numbers
that *should* correspond to the constant __NEW_UTS_LEN+1.  Everywhere
else, code assumes this and uses the constant, so this patch makes the
structure match.

Originally suggested by Serge here:

https://lists.linux-foundation.org/pipermail/containers/2009-March/016258.html

Signed-off-by: Dan Smith <danms@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/utsname.h

@@ -22,12 +22,12 @@ struct old_utsname {
 };
 
 struct new_utsname {
-	char sysname[65];
-	char nodename[65];
-	char release[65];
-	char version[65];
-	char machine[65];
-	char domainname[65];
+	char sysname[__NEW_UTS_LEN + 1];
+	char nodename[__NEW_UTS_LEN + 1];
+	char release[__NEW_UTS_LEN + 1];
+	char version[__NEW_UTS_LEN + 1];
+	char machine[__NEW_UTS_LEN + 1];
+	char domainname[__NEW_UTS_LEN + 1];
 };
 
 #ifdef __KERNEL__