iscsi-target: Use list_first_entry() where appropriate

Instead of using the obfuscated pattern of

	list_for_each_entry(var, list, ...)
		break;

to set var to the first entry of a list, use the straightforward

	var = list_first_entry(list, ...);

Reported-by: Joern Engel <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>

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