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rtcansend and rtcanrecv test and evaluate the return code of POSIX functions instead of errno. This bug sneaked in with: d245d6e6 utils/can: drop dependencies on obsolete rt_dev API As we are at it, a few missing "\n" of some error messages have been added as well. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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