staging/lustre/llite: Fix unused variable warning if !CONFIG_FS_POSIX_ACL

If CONFIG_FS_POSIX_ACL=n:

drivers/staging/lustre/lustre/llite/xattr.c: In function 'll_setxattr_common':
drivers/staging/lustre/lustre/llite/xattr.c:115:27: warning: unused variable 'rce' [-Wunused-variable]
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/xattr.c

@@ -112,8 +112,8 @@ int ll_setxattr_common(struct inode *inode, const char *name,
 	struct ptlrpc_request *req = NULL;
 	int xattr_type, rc;
 	struct obd_capa *oc;
-	struct rmtacl_ctl_entry *rce = NULL;
 #ifdef CONFIG_FS_POSIX_ACL
+	struct rmtacl_ctl_entry *rce = NULL;
 	posix_acl_xattr_header *new_value = NULL;
 	ext_acl_xattr_header *acl = NULL;
 #endif