fix hupper killing docker on start

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/packages/hupper/main.go

@@ -47,6 +47,9 @@ func main() {
 		if err != nil && err != io.EOF {
 			log.Fatalln("Error reading watch file", err)
 		}
+		if err == io.EOF {
+			continue
+		}
 		// a few changes eg debug do not require a daemon restart
 		// however at present we cannot check changes, and most do
 		restart := true