Bug 1104193 - nullcheck in nsContentUtils::GetASCIIOrigin, r=smaug

dom/base/nsContentUtils.cpp

@@ -5757,6 +5757,7 @@ nsContentUtils::GetASCIIOrigin(nsIURI* aURI, nsCString& aOrigin)
     nsCOMPtr<nsIPrincipal> principal;
     uriWithPrincipal->GetPrincipal(getter_AddRefs(principal));
 
+    if (principal) {
       nsCOMPtr<nsIURI> uri;
       nsresult rv = principal->GetURI(getter_AddRefs(uri));
       NS_ENSURE_SUCCESS(rv, rv);
@@ -5765,6 +5766,7 @@ nsContentUtils::GetASCIIOrigin(nsIURI* aURI, nsCString& aOrigin)
         return GetASCIIOrigin(uri, aOrigin);
       }
     }
+  }
 
   aOrigin.Truncate();