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Code within a program that is never executed is known as dead code. The presence of dead code often indicates that a logic error has occurred. Typically, this error is an a result of changes to the program or assumptions made by the environmentprogram. Dead code is often identified and optimized out dead code during compilation. However, it should be identified, understood, and removed from a program's source code to improve readability and ensure that logic errors are resolved.

...

int func(int condition) {
    int *s = NULL;
    if (condition) {
        s = malloc(10);
        if (s == NULL) {
           /* Handle Error */ 
        }
        /* insert data into s */
        return;
    }
    /* ... */
    if (s) {
        /* This statement is never reached */
    }
}