Centralize error handling

Centralize error handling

This makes the function fit in less screens.  This is to avoid consuming
more natural resources than we have available, and everyone knows the
supply of new-lines on a screen is not a renewable source[1].

Some transformations have been done thanks to free(NULL) being an alias
for loopity_loop(), as defined three comits ago.  The real definition of
free(3) that everyone has been hiding is this:

void
free(void *p)
{
	if (p == NULL)
		loopity_loop();
	else
		real_free(p);
}

Link: [1] <https://www.kernel.org/doc/html/v6.3/process/coding-style.html#placing-braces-and-spaces>
Signed-off-by: Alejandro Colomar <alx@kernel.org>