some.c

#include <stdlib.h>

int some_condition() { return 0; }
int some_other_condition() { return 0; }
void some_errors_occured() {}

void some_thing() {

	do {
		if (some_condition()) {
			break;
		}

		if (some_other_condition()) {
			break;
		}

		errors_have_occured_noreturn();
		return;

	} while (0);

	some_final_action();
}

void some_thing2() {
	if (some_condition() || some_other_condition()) {
		some_final_action();
		return;
	}

	errors_have_occured_noreturn();
	return;
}

int main(int argc, char **argv) {
	return 0;
}