Redirection reach unreachable code

[krichprollsch]

Try to request https://httpbin.io/links/1 which redirects to https://httpbin.io/links/1/0 crash the client.
here is the full trace.

$ zig build test                                                                 
info: request https://httpbin.io/links/1                                         
debug: REQUEST CONNECTED                                                         
debug: REQUEST SENT                                                              
debug: REQUEST FINISHED                                                          
thread 771757 panic: reached unreachable code                                    
/usr/local/zig-0.13.0/lib/std/debug.zig:412:14: 0x1246ecd in assert (test)       
    if (!ok) unreachable; // assertion failure                                   
             ^                                                                   
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:938:15: 0x15ec76a in prepareRedirect (test)
        assert(req.response.parser.done);                                        
              ^                                                                  
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:881:32: 0x15ecd07 in async_redirect (test)
        try req.prepareRedirect();                                               
                               ^                                                 
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:1416:35: 0x15cdd98 in onResponse (test)
            ctx.req.async_redirect(uri, ctx) catch |err| return ctx.pop(err);    
                                  ^                                              
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:1401:26: 0x150e14a in onResponseHeaders (test)
        return onResponse(ctx, {});                                              
                         ^                                                       
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:2460:13: 0x12506be in pop (test)
            return @call(.auto, func, .{ self, res });                           
            ^                                                                    
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:286:23: 0x150e6e6 in onFill (test)
        return ctx.pop({});                                                      
                      ^                                                          
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:2460:13: 0x12506be in pop (test)
            return @call(.auto, func, .{ self, res });                           
            ^                                                                    
/home/pierre/wrk/zig-async-io/src/tls.zig/connection.zig:303:35: 0x150ef9d in onReadv (test)
                    return ctx.pop({});                                          
                                  ^                                              
/home/pierre/wrk/zig-async-io/src/std/http/Client.zig:2460:13: 0x12506be in pop (test)
            return @call(.auto, func, .{ self, res });