t4211: fix incorrect rebase at f8395edc (range-set: satisfy non-empty ranges invariant)

Wnen I rewrote "cat b.c | wc -l" into "wc -l <b.c" to squash in a
suggestion on the list to this series, I screwed up subsequent
rebase.  Fix it up.

Signed-off-by: Junio C Hamano <gitster@pobox.com>