updated for version 7.4.492
Problem:    In Insert mode, after inserting a newline that inserts a comment
	    leader, CTRL-O moves to the right. (ZyX) Issue 57.
Solution:   Correct the condition for moving the cursor back to the NUL.
	    (Christian Brabandt)
Added tag v7-4-492 for changeset 5e998fc610d5