Bug 1280636 Call updatePollFds() on error on sentinel fd r=kmag

MozReview-Commit-ID: DCpxwsf65q0

--HG--
extra : rebase_source : de92cbf2da30cdf1a8971c28b0fe9b01c96fe24e

toolkit/modules/subprocess/subprocess_worker_unix.js

@@ -434,6 +434,7 @@ class Process extends BaseProcess {
       }
 
       this.fd.dispose();
+      io.updatePollFds();
       this.resolveExit(this.exitCode);
       return this.exitCode;
     }