PipeWrap::Connect() should handle errors from uv_pipe_connect2()

[bnoordhuis]

553169f switched from uv_pipe_connect() to uv_pipe_connect2(). The former doesn't return errors (it can't because void) but the latter can and does.

The comment here is no longer applicable:

node/src/pipe_wrap.cc

Line 237 in 89c66ae

args.GetReturnValue().Set(0); // uv_pipe_connect() doesn't return errors.