twister: Check lcov exit codes
Don't ignore lcov exit codes, but instead log and return if one of the
lcov commands fails.
Signed-off-by: 
Jeremy Bettis <jbettis@google.com>
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Don't ignore lcov exit codes, but instead log and return if one of the
lcov commands fails.
Signed-off-by: Jeremy Bettis <jbettis@google.com>