Fix quantum typo

Change-Id: Ib6343f5c6b7dedb8bda33110460372bc52b6c6a7
diff --git a/lib/quantum b/lib/quantum
index 0b26622..f9e1782 100644
--- a/lib/quantum
+++ b/lib/quantum
@@ -50,7 +50,7 @@
 }
 
 function is_quantum_ovs_base_plugin() {
-    local plguin=$1
+    local plugin=$1
     if [[ ",openvswitch,ryu," =~ ,${plugin}, ]]; then
         return 0
     fi