jc.Error within select statement causes panic in japecheck

[ChrisSchinnerl]

The following snippet when placed within the route's handler causes a panic in the jape check.

	select {
	case <-ctx.Done():
		jc.Error(errors.New("scan failed due to bus shutting down"), http.StatusServiceUnavailable)
		return
	default:
	}

Stacktrace:

panic: interface conversion: *ast.ExprStmt is not ast.Expr: missing method exprNode

goroutine 3290 [running]:
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8d0e0, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:439 +0x354
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8d080, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:497 +0x2f8
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8cfc0, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:441 +0x3dc
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8cea0, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:490 +0x5b4
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8cd80, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:490 +0x5b4
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8cc60, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:490 +0x5b4
go.sia.tech/jape.checkSingleResponse.func4(0x14010c8cba0, {0x0, 0x0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:442 +0x40c
go.sia.tech/jape.checkSingleResponse(0x1401e27a240, 0x1400d18b340)
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:525 +0x3dc
go.sia.tech/jape.run.func2({0x10267d810, 0x1401e2721c0})
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:715 +0x24c
go/ast.inspector.Visit(0x14010ca9320, {0x10267d810?, 0x1401e2721c0?})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:361 +0x38
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267d810, 0x1401e2721c0})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:34 +0x44
go/ast.walkList[...](...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:21
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267d748, 0x1401e272200})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:121 +0x2214
go/ast.walkList[...](...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:21
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267ddd8, 0x1401e279c40})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:203 +0x14bc
go/ast.walkList[...](...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:21
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267d798, 0x1401e27ad50})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:211 +0x2a04
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267d7e8, 0x1401e27ad80})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:332 +0xd90
go/ast.walkList[...](...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:21
go/ast.Walk({0x10267be28?, 0x14010ca9320?}, {0x10267d720, 0x140082560a0})
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:341 +0x2e24
go/ast.Inspect(...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/go/ast/walk.go:372
go.sia.tech/jape.run(0x1400d18b340)
	/Users/cschinnerl/go/src/github.com/SiaFoundation/jape/analyzer.go:699 +0x528
golang.org/x/tools/go/analysis/internal/checker.(*action).execOnce(0x1401f48e3c0)
	/Users/cschinnerl/go/pkg/mod/golang.org/x/[email protected]/go/analysis/internal/checker/checker.go:759 +0x924
sync.(*Once).doSlow(0x52?, 0x1401eaac290?)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/sync/once.go:76 +0xf8
sync.(*Once).Do(...)
	/opt/homebrew/Cellar/go/1.23.3/libexec/src/sync/once.go:67
golang.org/x/tools/go/analysis/internal/checker.(*action).exec(...)
	/Users/cschinnerl/go/pkg/mod/golang.org/x/[email protected]/go/analysis/internal/checker/checker.go:666
golang.org/x/tools/go/analysis/internal/checker.execAll.func1(0x0?)
	/Users/cschinnerl/go/pkg/mod/golang.org/x/[email protected]/go/analysis/internal/checker/checker.go:654 +0x48
created by golang.org/x/tools/go/analysis/internal/checker.execAll in goroutine 1
	/Users/cschinnerl/go/pkg/mod/golang.org/x/[email protected]/go/analysis/internal/checker/checker.go:660 +0x148