This code was added in 85b260fba8, but didn't
account for maps.Clone returning a `nil` map if the map cloned was `nil`.
This could lead to a panic, similar to the panic that was fixed in
7517464283d29969c4d3615397b369abd99ce395;
panic: assignment to entry in nil map
goroutine 498 [running]:
github.com/moby/moby/v2/daemon.buildPortsRelatedCreateEndpointOptions(0x400042f348, 0xaaaabcc8f458?, 0x40006feb40)
/root/build-deb/engine/daemon/network.go:1047 +0x844
github.com/moby/moby/v2/daemon.buildCreateEndpointOptions(0x400042f348, 0x4001015040, 0x400027d320, 0x40006feb40, {0x0, 0x0, 0x4001506cb8?})
/root/build-deb/engine/daemon/network.go:988 +0x20c
github.com/moby/moby/v2/daemon.(*Daemon).connectToNetwork(0x4000898008, {0xaaaabe21d9f8, 0x4000f12b10}, 0x400089a008, 0x400042f348, {0x400077a9f0, 0x6}, 0x400027d320)
/root/build-deb/engine/daemon/container_operations.go:738 +0x66c
github.com/moby/moby/v2/daemon.(*Daemon).allocateNetwork(0x4000898008, {0xaaaabe21d9f8, 0x4000f12b10}, 0x400089a008, 0x400042f348)
/root/build-deb/engine/daemon/container_operations.go:421 +0x298
github.com/moby/moby/v2/daemon.(*Daemon).initializeCreatedTask(0x4000898008, {0xaaaabe21d9f8, 0x4000f12b10}, 0x400089a008, {0xaaaabe23dc60, 0x4000eb21c8}, 0x400042f348, 0xaaaabd4db3df?)
/root/build-deb/engine/daemon/start_linux.go:37 +0x260
github.com/moby/moby/v2/daemon.(*Daemon).containerStart(0x4000898008, {0xaaaabe21d9c0, 0xaaaabfa05300}, 0x400089a008, 0x400042f348, {0x0, 0x0}, {0x0, 0x0}, 0x1)
/root/build-deb/engine/daemon/start.go:242 +0xba8
github.com/moby/moby/v2/daemon.(*Daemon).restore.func4(0x400042f348, 0x400117f1f0)
/root/build-deb/engine/daemon/daemon.go:633 +0x308
created by github.com/moby/moby/v2/daemon.(*Daemon).restore in goroutine 1
/root/build-deb/engine/daemon/daemon.go:607 +0x5ec
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
695010ba2e