govet panic with 1.7 and 1.7.1

[srenatus]

Trying to upgrade from 1.5 to 1.7.1, I've run into this:

$ golangci-lint run -c ../../.golangci.toml ./...
WARN [runner] Panic stack trace: goroutine 1486 [running]:
runtime/debug.Stack(0x180a3e1, 0x11, 0xc4322a52a0)
        /usr/local/go/src/runtime/debug/stack.go:24 +0xa7
github.com/golangci/golangci-lint/pkg/lint.Runner.runLinterSafe.func1(0xc4322a5ba8, 0xc432a21b80, 0xb, 0xb, 0x18c5ba0, 0xc42e5eac40)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:73 +0xbc
panic(0x171d220, 0x1cd5500)
        /usr/local/go/src/runtime/panic.go:502 +0x229
github.com/golangci/golangci-lint/vendor/github.com/golangci/govet.doPackage(0x0, 0xc420d22000, 0xc42016cb00, 0x0, 0x0, 0x0, 0xc43dcdf860, 0x0, 0x0)
        /Users/denis/go/src/github.com/golangci/golangci-lint/vendor/github.com/golangci/govet/main.go:452 +0xc08
github.com/golangci/golangci-lint/vendor/github.com/golangci/govet.Analyze(0x0, 0x0, 0x0, 0xc42016cb00, 0xc420d22000, 0x0, 0x1, 0x1, 0x1, 0x0, ...)
        /Users/denis/go/src/github.com/golangci/golangci-lint/vendor/github.com/golangci/govet/golangci.go:41 +0x26b
github.com/golangci/golangci-lint/pkg/golinters.Govet.runOnSourcePackages(0x18c3340, 0xc420164c00, 0xc432d7b140, 0xc42ce0fc20, 0xc, 0xc42ce0fc20, 0xc, 0xc)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/golinters/govet.go:219 +0x166
github.com/golangci/golangci-lint/pkg/golinters.Govet.Run(0x18c3340, 0xc420164c00, 0xc432d7b140, 0x10106e8, 0xc4207c6980, 0xc42002f0e0, 0x17f474a, 0xc42e5ead60)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/golinters/govet.go:40 +0x436
github.com/golangci/golangci-lint/pkg/lint.Runner.runLinterSafe(0xc432a21b80, 0xb, 0xb, 0x18c5ba0, 0xc42e5eac40, 0x18c3340, 0xc420164c00, 0xc432d7af60, 0x18c2500, 0x1d074a8, ...)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:79 +0x194
github.com/golangci/golangci-lint/pkg/lint.Runner.runWorker.func1()
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:111 +0xe9
github.com/golangci/golangci-lint/pkg/timeutils.(*Stopwatch).TrackStage(0xc437c90370, 0x17f2ffa, 0x5, 0xc4207c6e50)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/timeutils/stopwatch.go:75 +0x53
github.com/golangci/golangci-lint/pkg/lint.Runner.runWorker(0xc432a21b80, 0xb, 0xb, 0x18c5ba0, 0xc42e5eac40, 0x18c3340, 0xc420164c00, 0xc432d7af60, 0xc432d7afc0, 0xc432d7b020, ...)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:110 +0x1e4
github.com/golangci/golangci-lint/pkg/lint.(*Runner).runWorkers.func1(0xc42ce0fbf0, 0xc428af4b10, 0x18c3340, 0xc420164c00, 0xc432d7af60, 0xc432d7afc0, 0xc432d7b020, 0xc422b02300, 0x8, 0x8, ...)
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:165 +0x152
created by github.com/golangci/golangci-lint/pkg/lint.(*Runner).runWorkers
        /Users/denis/go/src/github.com/golangci/golangci-lint/pkg/lint/runner.go:162 +0x1b8
WARN [runner] Can't run linter govet: panic occured: runtime error: index out of range
Congrats! No issues were found.

ℹ️ Trying other versions:

• 1.6.1: ✅
• 1.7: 💥

⏩ The problem seems to be around a package that has only test files -- and I presume it panics here, pkg.path = astFiles[0].Name.Name.

[jirfag]

thank you!
fast fix is in #123,
then I will add tests and improve it

[srenatus]

Thank you 🎉