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Fixes a test flake on TestTailnet_ForcesWebsockets like:
```
t.go:106: 2024-11-18 07:44:25.939 [debu] w2: dial tcp addr_port="[fd7a:115c:a1e0:46cc:bd8e:400d:1bc6:f6ac]:35565"
t.go:106: 2024-11-18 07:44:25.943 [debu] w1.net.netstack: netstack: could not connect to local server at 127.0.0.1:35565 (or [::1]:35565)%!(EXTRA *net.OpError=dial tcp [::1]:35565: connect: connection refused)
conn_test.go:146:
Error Trace: /Users/spike/repos/coder/tailnet/conn_test.go:146
Error: Received unexpected error:
connect tcp [fd7a:115c:a1e0:46cc:bd8e:400d:1bc6:f6ac]:35565: connection was refused
Test: TestTailnet/ForcesWebSockets
t.go:106: 2024-11-18 07:44:25.945 [info] w1: closing tailnet Conn
t.go:106: 2024-11-18 07:44:25.945 [debu] w1: closing configMaps configLoop
t.go:106: 2024-11-18 07:44:25.945 [debu] w1: closing nodeUpdater updateLoop
t.go:106: 2024-11-18 07:44:25.945 [debu] w1: closed netstack
conn_test.go:135:
Error Trace: /Users/spike/repos/coder/tailnet/conn_test.go:135
/Users/spike/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.22.8.darwin-arm64/src/runtime/asm_arm64.s:1222
Error: Received unexpected error:
connection closed:
github.com/coder/coder/v2/tailnet.init
<autogenerated>:1
Test: TestTailnet/ForcesWebSockets
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1039771dc]
goroutine 2224 [running]:
github.com/coder/coder/v2/tailnet_test.TestTailnet.func3.2()
/Users/spike/repos/coder/tailnet/conn_test.go:136 +0x7c
created by github.com/coder/coder/v2/tailnet_test.TestTailnet.func3 in goroutine 109
/Users/spike/repos/coder/tailnet/conn_test.go:133 +0x7dc
```
Test didn't synchronize listening on the port before dialing it.
It also has a nil pointer deference when the test fails, which causes a bunch of unrelated output. Also fixed.