src: fix tracing if cwd or file path is inaccessible

Otherwise this would have crashed the process.
In particular, checking the return value of an libuv call against `-1`
was invalid to begin with, as libuv uses it to propagate the
error code.

PR-URL: https://github.com/nodejs/node/pull/21867


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>