Programming "What-if"?

Is it considered bad practice to do this?

Code:

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    unsigned char* fileContents;

    //Following function returns a memory location of heap-allocated data
    fileContents = GetFileContents("foo.txt");
    free(fileContents);

    fileContents = GetFileContents("bar.txt");
    free(fileContents);

    return 0;
}

In other words, is it bad practice to use a pointer twice as I've done above? If so, what's the correct thing to do?