No assignment of return value

[Jonas]

Describe the bug

Ghidra does not use the the return value of a function

Go version: 1.12
Target os: Linux
Ghidra version: 9.0.4

To Reproduce

1. Load binary (testdata functions.go)
2. Analyze binary
3. see that main.main does not assign the return values

Minimal source to reproduce

(testdata functions.go)

Additional context

NationalSecurityAgency/ghidra#692