netchan: make -1 unlimited, as advertised.

R=adg
CC=golang-dev
https://golang.org/cl/2198042

src/pkg/netchan/common.go

@@ -39,7 +39,7 @@ type header struct {
 
 // Sent with a header once per channel from importer to exporter to report
 // that it wants to bind to a channel with the specified direction for count
-// messages.  If count is zero, it means unlimited.
+// messages.  If count is -1, it means unlimited.
 type request struct {
 	count int64
 	dir   Dir

src/pkg/netchan/import.go

@@ -114,7 +114,7 @@ func (imp *Importer) run() {
 // Import imports a channel of the given type and specified direction.
 // It is equivalent to ImportNValues with a count of -1, meaning unbounded.
 func (imp *Importer) Import(name string, chT interface{}, dir Dir) os.Error {
-	return imp.ImportNValues(name, chT, dir, 0)
+	return imp.ImportNValues(name, chT, dir, -1)
 }
 
 // ImportNValues imports a channel of the given type and specified direction