p2p: don't discard reason set by Disconnect (ethereum#16559)

gsalgado · mariameda · commit 9b7dd9a5fe62 · 2018-08-19T19:55:14.000+04:30
Peer.run was discarding the reason for disconnection sent to the disc
channel by Disconnect.
diff --git a/p2p/peer.go b/p2p/peer.go
@@ -220,6 +220,7 @@ loop:
 			reason = discReasonForError(err)
 			break loop
 		case err = <-p.disc:
+			reason = discReasonForError(err)
 			break loop
 		}
 	}

Original file line number	Diff line number	Diff line change
`@@ -220,6 +220,7 @@ loop:`
`220`	`220`	`reason = discReasonForError(err)`
`221`	`221`	`break loop`
`222`	`222`	`case err = <-p.disc:`
	`223`	`+ reason = discReasonForError(err)`
`223`	`224`	`break loop`
`224`	`225`	`}`
`225`	`226`	`}`