[DAHTOOL-2] dahdi_cfg: Compiler warnings

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  dahdi_monitor.o
  CCLD     dahdi_monitor
  CC       dahdi_cfg.o
dahdi_cfg.c: In function ‘are_all_spans_assigned’:
dahdi_cfg.c:153:21: warning: ‘/span_count’ directive output may be truncated writing 11 bytes into a region of size between 0 and 1023 [-Wformat-truncation=]
  153 |                  "%s/span_count", device_path);
      |                     ^~~~~~~~~~~
In function ‘_are_all_spans_assigned’,
    inlined from ‘are_all_spans_assigned’ at dahdi_cfg.c:213:9:
dahdi_cfg.c:152:9: note: ‘snprintf’ output between 12 and 1035 bytes into a destination of size 1023
  152 |         snprintf(attribute, sizeof(attribute) - 1,
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  153 |                  "%s/span_count", device_path);
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CCLD     dahdi_cfg

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