SELinux: change sbsec->behavior to short

We only have 6 options, so char is good enough, but use a short as that
packs nicely.  This shrinks the superblock_security_struct just a little
bit.

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index fe99f64..b1dfe10 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -58,7 +58,7 @@
 	u32 sid;			/* SID of file system superblock */
 	u32 def_sid;			/* default SID for labeling */
 	u32 mntpoint_sid;		/* SECURITY_FS_USE_MNTPOINT context for files */
-	unsigned int behavior;		/* labeling behavior */
+	unsigned short behavior;	/* labeling behavior */
 	unsigned short flags;		/* which mount options were specified */
 	struct mutex lock;
 	struct list_head isec_head;