Friendly return

bin/start.sh

@@ -55,8 +55,8 @@ function startbootnode
 {
     local   keyfile=${BFANETWORKDIR}/bootnode/key
     local   pidfile=${BFANETWORKDIR}/bootnode/bootnode.pid
-    which bootnode >/dev/null 2>&1  || return
-    test -r $keyfile                || return
+    which bootnode >/dev/null 2>&1  || return 0
+    test -r $keyfile                || return 0
     (
         flock --nonblock --exclusive 9 || (
             echo "A bootnode is already running."
@@ -104,7 +104,7 @@ function startmonitor
 function startgeth
 {
     # Start the node.
-    which geth >/dev/null 2>&1        || return
+    which geth >/dev/null 2>&1        || return 0
     (
         flock --nonblock --exclusive 9  || (
             echo "A geth is already running."