fix: panic with cgo

[ldez]

runtime error: invalid memory address or nil pointer dereference: goroutine 323 [running]:
runtime/debug.Stack()
	/usr/lib/go/src/runtime/debug/stack.go:26 +0x5e
github.com/golangci/golangci-lint/pkg/goanalysis.(*action).analyzeSafe.func1()
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_action.go:50 +0x277
panic({0x19a4240?, 0x2802480?})
	/usr/lib/go/src/runtime/panic.go:785 +0x132
github.com/Crocmagnon/fatcontext/pkg/analyzer.(*runner).run.func1({0x1e47978, 0xc001019e60})
	/home/ldez/sources/go/pkg/mod/github.com/!crocmagnon/[email protected]/pkg/analyzer/analyzer.go:65 +0xf9
golang.org/x/tools/go/ast/inspector.(*Inspector).Preorder(0xc0009582d0, {0xc002a83ab8?, 0x28325c0?, 0xffffffffffffffff?}, 0xc0018b5af8)
	/home/ldez/sources/go/pkg/mod/golang.org/x/[email protected]/go/ast/inspector/inspector.go:96 +0x8f
github.com/Crocmagnon/fatcontext/pkg/analyzer.(*runner).run(0xc00110ade2, 0xc0027862a0)
	/home/ldez/sources/go/pkg/mod/github.com/!crocmagnon/[email protected]/pkg/analyzer/analyzer.go:59 +0xea
github.com/golangci/golangci-lint/pkg/goanalysis.(*action).analyze.func3(0xc0011c2280, 0xc0027862a0)
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_checker.go:182 +0xeb
github.com/golangci/golangci-lint/pkg/goanalysis.(*action).analyze(0xc0011c2280)
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_checker.go:208 +0xa9c
github.com/golangci/golangci-lint/pkg/timeutils.(*Stopwatch).TrackStage(0xc001ac42d0, {0x1b6de9f, 0xa}, 0xc001ad1748)
	/home/ldez/sources/golangci/golangci-lint/pkg/timeutils/stopwatch.go:111 +0x44
github.com/golangci/golangci-lint/pkg/goanalysis.(*action).analyzeSafe(0xc00258b380?)
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_action.go:54 +0x71
github.com/golangci/golangci-lint/pkg/goanalysis.(*loadingPackage).analyze.func2(0xc0011c2280)
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_loadingpackage.go:83 +0xa5
created by github.com/golangci/golangci-lint/pkg/goanalysis.(*loadingPackage).analyze in goroutine 162
	/home/ldez/sources/golangci/golangci-lint/pkg/goanalysis/runner_loadingpackage.go:78 +0x1e9