kernel: guard nuke_ext4_sysfs

Rather than using depends on / select,
i just prefer this way, although, yes, it is
an ifdef hell.

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/core_hook.c

@@ -310,6 +310,7 @@ int ksu_handle_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 	return 0;
 }
 
+#ifdef CONFIG_EXT4_FS
 static void nuke_ext4_sysfs() {
 	struct path path;
 	int err = kern_path("/data/adb/modules", 0, &path);
@@ -329,6 +330,9 @@ static void nuke_ext4_sysfs() {
 	ext4_unregister_sysfs(sb);
  	path_put(&path);
 }
+#else
+static inline void nuke_ext4_sysfs() { }
+#endif
 
 int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		     unsigned long arg4, unsigned long arg5)