Revert "integrity: double check iint_cache was initialized"

With the recent introduction of LSM_ORDER_LAST, the 'integrity' LSM is
always initialized (if selected in the kernel configuration) and the
iint_cache is always created (the kernel panics on error). Thus, the
additional check of iint_cache in integrity_inode_get() is no longer
necessary. If the 'integrity' LSM is not selected in the kernel
configuration, integrity_inode_get() just returns NULL.

This reverts commit 92063f3c.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/integrity/iint.c

@@ -98,14 +98,6 @@ struct integrity_iint_cache *integrity_inode_get(struct inode *inode)
 	struct rb_node *node, *parent = NULL;
 	struct integrity_iint_cache *iint, *test_iint;
 
-	/*
-	 * The integrity's "iint_cache" is initialized at security_init(),
-	 * unless it is not included in the ordered list of LSMs enabled
-	 * on the boot command line.
-	 */
-	if (!iint_cache)
-		panic("%s: lsm=integrity required.\n", __func__);
-
 	iint = integrity_iint_find(inode);
 	if (iint)
 		return iint;