Fix style

dotfiles/imapdomo/common.lua

@@ -18,8 +18,13 @@ function file_exists(name)
     --
     -- True if file *name* exists
     --
-    local f=io.open(name,"r")
-    if f~=nil then io.close(f) return true else return false end
+    local f = io.open(name,"r")
+    if f ~= nil then
+        io.close(f)
+        return true
+    else
+        return false
+    end
 end
 
 function init_host()