Wrong flag generated with anonymous embedded struct

[ogerardin]

The doc says that you can use anonymous sub-structures, and the example implies that when the flag name is generated, the sub-structure is "squashed" (see --db.ip in the example).

I have a case that demonstrates a bug in the generation of the flag name, when an anonymous sub-structure follows a named sub-structure.

This configuration:

type EmbeddedConfig struct {
	P2 int `description:"p2"`
}

type Config struct{
	P1 int `description:"p1"`
	EmbeddedConfig
}

generates the following flags:

Flags:
    --p1    p1                                 (default "0")
    --p1.p2 p2                                 (default "0")

The second flag should be --p2, not --p1.p2

If you swap the members of Config (P1 after the anonymous EmbeddedConfig), the flags are generated correctly
Attached is a source file that shows this behaviour.

flaeg_test.go.zip