selftests: fix the return value for UDP GRO test
The udpgro.sh will always return 0 (unless the bpf selftest was not build first) even if there are some failed sub test-cases. Therefore the kselftest framework will report this case is OK. Check and return the exit status of each test to make it easier to spot real failures. Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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