In the case the pointer could be NULL, the function that gave the caller
the NULL pointer would already have issued an error message, so simply
returning early with an error status without issuing a new message is
sufficient. The same for parse_commit() that will show necessary error
message when the argument is not NULL, and will return error silently
when the argument is NULL.
Noticed-by: Michael Mueller Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>