Fix return values in GClueLocationSource start() implementations
More fallout from !94 (merged). Does not actually change anything in the build result, since GCLUE_LOCATION_SOURCE_START_RESULT_FAILED == FALSE == 0, but reduces confusion.
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More fallout from !94 (merged). Does not actually change anything in the build result, since GCLUE_LOCATION_SOURCE_START_RESULT_FAILED == FALSE == 0, but reduces confusion.