coffeescript 1.7.1 'unexpected if' (+fix)

[coderofsalvation]

$ ./tailgate.coffee
/home/sqz/projects/tailgate/bin/tailgate.coffee:240:16: error: unexpected if
@refs[dir] = if @refs[dir]? @refs[dir]+1 else 1
^^
$ git diff
diff --git a/bin/tailgate.coffee b/bin/tailgate.coffee
index ca5b6e5..6a93c20 100755
--- a/bin/tailgate.coffee
+++ b/bin/tailgate.coffee
@@ -237,7 +237,7 @@ class Tailer
register: (dir, format) ->

                # track refs so we know when to kill the tail process
-               @refs[dir] = if @refs[dir]? @refs[dir]+1 else 1
+               @refs[dir] = @refs[dir]? @refs[dir]+1 : 1

                path = env.TAILGATE_DATA_DIR+"/"+dir