security: Make inode argument of inode_getsecurity non-const

Make the inode argument of the inode_getsecurity hook non-const so that
we can use it to revalidate invalid security labels.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>

security/selinux/hooks.c

@@ -3108,7 +3108,7 @@ static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
  *
  * Permission check is handled by selinux_inode_getxattr hook.
  */
-static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
+static int selinux_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc)
 {
 	u32 size;
 	int error;