refactor this part of code for upcoming change

tail.go

@@ -213,9 +213,7 @@ func (tail *Tail) tailFileSync() {
 	for {
 		line, err := tail.readLine()
 
-		switch err {
-		case nil:
-			if true {
+		if err == nil {
 			cooloff := !tail.sendLine(line)
 			if cooloff {
 				// Wait a second before seeking till the end of
@@ -235,9 +233,7 @@ func (tail *Tail) tailFileSync() {
 					return
 				}
 			}
-			}
-		case io.EOF:
-			// XXX: should `line` be returned at this point?
+		}else if err == io.EOF {
 			if !tail.Follow {
 				return
 			}
@@ -251,7 +247,8 @@ func (tail *Tail) tailFileSync() {
 				}
 				return
 			}
-		default: // non-EOF error
+		}else {
+			// non-EOF error
 			tail.Killf("Error reading %s: %s", tail.Filename, err)
 			return
 		}