Context unable to bind twice

[mcquackers]

Issue Description

Using c.Bind(&exampleStruct) properly binds the incoming data to the struct, but then subsequently calling c.Bind(&differentExampleStruct) silently fails to bind.

Reversing the order of the bindings produces the same issue with respect to the bindings (&differentExampleStruct is the populated, but &exampleStruct is left empty)

Checklist

• [X ] Dependencies installed
• [ X] No typos
• Searched existing issues and docs

Expected behaviour

All structs are populated with respective data from the request

Actual behaviour

Only the first struct is populated with data from the request

Steps to reproduce

Have an incoming request with JSON data that is a superset of the fields of two (or more) structs

Attempt to bind the incoming echo.Context to each struct.

See that only the first struct gets properly bound

[mcquackers]

I are dumb

[vishr]

@mcquackers You can look into this comment #782 (comment)