optionFindNextValue - find a hierarcicaly valued option instance

       This routine will find the next entry in a nested value option or configurable.  It will  search  through
       the list and return the next entry that matches the criteria.

       odesc  an option with a nested arg type

       pPrevVal
              the last entry

       name   name of value to find

       value  the matching value

       The returned result is NULL and errno is set:

       EINVAL - the pOptValue does not point to a valid hierarchical option value.

       ENOENT - no entry matched the given name.  @end itemize

       optionFindNextValue - find a hierarcicaly valued option instance

       a compound value structure

       The info documentation for the -lopts library.
       ao_string_tokenize(3),    configFileLoad(3),    optionFileLoad(3),   optionFindValue(3),   optionFree(3),
       optionGetValue(3),  optionLoadLine(3),   optionMemberList(3),   optionNextValue(3),   optionOnlyUsage(3),
       optionPrintVersion(3),      optionPrintVersionAndReturn(3),      optionProcess(3),      optionRestore(3),
       optionSaveFile(3),    optionSaveState(3),    optionUnloadNested(3),    optionVersion(3),    strequate(3),
       streqvcmp(3), streqvmap(3), strneqvcmp(3), strtransform(3),

                                                   2018-08-26                             optionFindNextValue(3)

       #include <your-opts.h>
       cc [...] -o outfile infile.c -lopts [...]

       const  tOptionValue  *  optionFindNextValue(const  tOptDesc  * odesc, const tOptionValue * pPrevVal, char
       const * name, char const * value);