added missing "" line 15

ohpc-instance/main.tf

@@ -12,7 +12,7 @@ variable "internal_net" {}
 variable "external_net" {}
 
 # is created in floating-ip module and called in root module
-variable "floating_ip_ohpc" {type = string}
+variable "floating_ip_ohpc" {type = "string"}
 
 variable "host_prefix" {}
 variable "ohpc_user" {}