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block: fix off-by-one error in qcow and qcow2
This fixes an off-by-one error introduced in 9a29e18. Both qcow and qcow2 need to make sure to leave room for string terminator '\0' for the backing file, so the max length of the non-terminated string is either 1023 or PATH_MAX - 1. Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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