Fix memory leakage by freeing tree when decoding

Also adjust some spaces and whatnot.

huffman.c

@@ -62,6 +62,7 @@ int encode_file(FILE *in, FILE *out)
 
 	fseek(in, 0, SEEK_SET);
 	char *buf = read_text(in, size);
+
 	encode_tree(&bitbuf, tree, buf, size);
 
 	free(buf);
@@ -72,20 +73,19 @@ int encode_file(FILE *in, FILE *out)
 
 int decode_file(FILE *in, FILE *out)
 {
+	struct tree *tree = malloc(sizeof(*tree));
 	struct BIT_BUFFER bitbuf;
 	bb_init(&bitbuf, in);
 
-	struct tree *decoded = malloc(sizeof(*decoded));
-
 	fseek(in, 0, SEEK_SET);
-	decode_header(&bitbuf, decoded);
+	decode_header(&bitbuf, tree);
 
-	decode_tree(&bitbuf, out, decoded);
+	decode_tree(&bitbuf, out, tree);
 
 	if (DEBUG)
-		print_tree(decoded);
+		print_tree(tree);
 
-	free(decoded);
+	free_tree(tree);
 
 	return 0;
 }