mufs: implement mufs_del_tree() to safely free tree objects from memory

source/fs/mufs/tree.c

@@ -12,6 +12,21 @@
 #include "dir.h"
 #include "tree.h"
 
+void mufs_del_tree(struct mufs_tree *tree)
+{
+	struct mufs *fs;
+
+	if (!tree)
+		return;
+
+	fs = tree->fs;
+
+	if (tree == &fs->root)
+		return;
+
+	free(tree);
+}
+
 static int mufs_do_lookup(struct mufs *fs, uint32_t *page,
 	uint32_t base, uint8_t depth, uint32_t va, uint32_t new_page,
 	unsigned alloc)

source/fs/mufs/tree.h

@@ -1,5 +1,6 @@
 #pragma once
 
+void mufs_del_tree(struct mufs_tree *tree);
 int mufs_lookup_page(struct mufs_tree *tree, uint32_t *page,
 	uint32_t va);
 int mufs_map_page(struct mufs_tree *tree, uint32_t va, uint32_t page);