CheckInput: fix equals() method  

Change-Id: I4426d091a667792aee389d5c4561595f5f0f5bee
diff --git a/java/com/google/gerrit/plugins/checks/api/CheckInput.java b/java/com/google/gerrit/plugins/checks/api/CheckInput.java
index 5d1d970..31d8a35 100644
--- a/java/com/google/gerrit/plugins/checks/api/CheckInput.java
+++ b/java/com/google/gerrit/plugins/checks/api/CheckInput.java
@@ -34,10 +34,10 @@
 
   @Override
   public boolean equals(Object o) {
-    if (!(o instanceof CheckInfo)) {
+    if (!(o instanceof CheckInput)) {
       return false;
     }
-    CheckInfo other = (CheckInfo) o;
+    CheckInput other = (CheckInput) o;
     return Objects.equals(other.checkerUuid, checkerUuid)
         && Objects.equals(other.state, state)
         && Objects.equals(other.url, url)