Panic when ConnContext is not set #161
Description
If srv.h1.ConnContext is nil (unset), this line will cause panic
Originally posted by @yusing in #140
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xe6f026]
goroutine 567 [running]:
github.com/pires/go-proxyproto/helper/http2.(*Server).serveConn(0xc0009d4230, {0x2321d10, 0xc0009b8e08}, {0x23147d8, 0xc0006965a0})
/home/yusing/.local/go/pkg/mod/github.com/pires/go-proxyproto@v0.9.2/helper/http2/http2.go:161 +0x2c6
github.com/pires/go-proxyproto/helper/http2.(*Server).Serve.func2({0x2321d10?, 0xc0009b8e08?}, {0x23147d8?, 0xc0006965a0?})
/home/yusing/.local/go/pkg/mod/github.com/pires/go-proxyproto@v0.9.2/helper/http2/http2.go:120 +0x69
created by github.com/pires/go-proxyproto/helper/http2.(*Server).Serve in goroutine 482
/home/yusing/.local/go/pkg/mod/github.com/pires/go-proxyproto@v0.9.2/helper/http2/http2.go:119 +0x1af