Setting variable to NULL after free

In my company there is a coding rule that says, after freeing any memory, reset the variable to NULL. For example …

void some_func () 
    int *nPtr;

    nPtr = malloc (100);

    free (nPtr);
    nPtr = NULL;


I feel that, in cases like the code shown above, setting to NULL does not have any meaning. Or am I missing something?

If there is no meaning in such cases, I am going to take it up with the “quality team” to remove this coding rule. Please advice.

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