[Bug 2031563] Re: json input link with calc->expr->pva not working

[mdavidsaver via Core-talk <core-talk at aps.anl.gov>]

see https://github.com/epics-base/pva2pva/issues/59

** Bug watch added: github.com/epics-base/pva2pva/issues #59
   https://github.com/epics-base/pva2pva/issues/59

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https://bugs.launchpad.net/bugs/2031563

Title:
  json input link with calc->expr->pva not working

Status in EPICS Base:
  New

Bug description:
  The database below fails with
  ```
  pvaLink void {anonymous}::pvaOpenLink(DBLINK*) fails MTEST-JSON:inp_json_calc: DBLINK* corrupt
  ```

  system details:
  linux x86_64
  EPICS R7.0.7-DEV, as well as R7.0.7

  database
  ```
  record(ai, "MTEST-JSON:A1") {
      field(VAL,  1)
      field(PINI, 1)
  }

  record(ai, "MTEST-JSON:inp_json_calc") {
      field(INP,
          {
              "calc": {
                  "expr": "A|B|C",
                  "args": [
                      {
                          "const": 0
                      },
                      0,
                      {
                          "pva": {
                              "pv": "MTEST-JSON:A1",
                              "proc": "CP"
                          }
                      }
                  ]
              }
          }
      )
  }
  ```

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