Memory leak fixed for printpath routine

checked with `du -k /etc | valgrind --leak-check=full --show-leak-kinds=all ./xdu`

xdu.c

@@ -696,17 +696,21 @@ void printpath(int x, int y)
 {
     struct node *np;
     char* path;
+    char* tmp_path;
 
     np = findnode(&top, x, y);
     if (np == NULL)
         return;
-    path = np->name;
+    asprintf(&path, "%s", np->name);
     while(np->parent != NULL) {
+        tmp_path = path;
         asprintf(&path, "%s/%s", np->parent->name, path);
         np = np->parent;
+        free(tmp_path);
     }
-    path += 6;
-    printf("%s\n", path);
+    tmp_path = path + 6;
+    printf("%s\n", tmp_path);
+    free(path);
 }
 
 void reset(void)