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You correct it by doing something else useful with the struct. Access one of its members, or get the address of the struct. One of the few things that might be useful with just n is to compare it to another "struct node", but to compare it to an integer that starts with 0 might not be what you want. Or is it? This is why my previous answer was so short.
For a lot of things in C, you can cast from one type to another, as in this:
n = (struct node *)malloc( sizeof( struct node ));
This thing would repeatedly print one tabulator character.
To make this fact more clearly visible, i would really suggest to indent the following printf-line, as this will be the only thing that would be executed as body of the for() loop.
And then, how many TAB characters do you intend to print?
You probably want to remove the for() line entirely?
You are correct. I didn't look at the OP's code carefully enough the first time to see that.
maybe "h" means "number of horizontal tabulators"?
h represents how many levels of the sideways tree being printed are to the left of the subtree currently being printed. It is a recursive tree printing routine. That is what I didn't pay attention to the first time. So for the actual printing at each level (the part other than the recursion), you need h tabs to the left of the text.