wgengine/tstun: fix alignment of 64-bit atomic field
We had a test for it, but no 32-bit builder apparently. :(
Fixes
@@ -58,6 +58,7 @@ type TUN struct {
// tdev is the underlying TUN device.
tdev tun.Device
+ _ [4]byte // force 64-bit alignment of following field on 32-bit
lastActivityAtomic int64 // unix seconds of last send or receive
// buffer stores the oldest unconsumed packet from tdev.
