refspec: rename struct refspec to struct refspec_item
In preparation for introducing an abstraction around a collection of refspecs (much like how a 'struct pathspec' is a collection of 'struct pathspec_item's) rename the existing 'struct refspec' to 'struct refspec_item'. Signed-off-by: NBrandon Williams <bmwill@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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