selinux: fix allocation failure check on newpolicy->sidtab

The allocation check of newpolicy->sidtab is null checking if
newpolicy is null and not newpolicy->sidtab. Fix this.

Addresses-Coverity: ("Logically dead code")
Fixes: c7c556f1 ("selinux: refactor changing booleans")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/ss/services.c

@@ -2224,7 +2224,7 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len,
 		return -ENOMEM;
 
 	newpolicy->sidtab = kzalloc(sizeof(*newpolicy->sidtab), GFP_KERNEL);
-	if (!newpolicy)
+	if (!newpolicy->sidtab)
 		goto err;
 
 	rc = policydb_read(&newpolicy->policydb, fp);