Revert "kernel: core_hook: earlier escape_to_root already-root check"

This reverts commit 6df2225.

Author: backslashxx

kernel/core_hook.c

@@ -137,17 +137,18 @@ void escape_to_root(void)
 {
 	struct cred *cred;
 
-	if (current_euid().val == 0) {
-		pr_warn("Already root, don't escape!\n");
-		return;
-	}
-
 	cred = prepare_creds();
 	if (!cred) {
 		pr_warn("prepare_creds failed!\n");
 		return;
 	}
 
+	if (cred->euid.val == 0) {
+		pr_warn("Already root, don't escape!\n");
+		abort_creds(cred);
+		return;
+	}
+
 	struct root_profile *profile = ksu_get_root_profile(cred->uid.val);
 
 	cred->uid.val = profile->uid;