testsuite: Don't use grep -q in unpack_sums_7
grep -q
closes stdin as soon as it finds the pattern it is looking
for, resulting in #22484.
I have also marked unpack_sums_6
as fragile due to #22504 (closed).
grep -q
closes stdin as soon as it finds the pattern it is looking
for, resulting in #22484.
I have also marked unpack_sums_6
as fragile due to #22504 (closed).