improve error msg of rcl_expand_topic_name
#1076
Merged
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If
RCL_RET_TOPIC_NAME_INVALID
is returned the error msg is obtained by callingrcl_topic_name_validation_result_string
to ease debugging invalid topics.I think this change would be useful because currently I have to debug erratically failing subscription initialisations at work and having a more specific error message would help a lot in understanding what went wrong in the future.