Remove trailing 's' from ${loop_iterations}

It should be ${loop_iteration}

Signed-off-by: Gene Ratzlaff <generatz@gmail.com>
Change-Id: Ibedd93920f36ca1f46da25a45e58fd62b9ab9823
diff --git a/security/test_bmc_connections.robot b/security/test_bmc_connections.robot
index ee55a58..0c458b1 100644
--- a/security/test_bmc_connections.robot
+++ b/security/test_bmc_connections.robot
@@ -133,7 +133,7 @@
 
     SSHLibrary.Open Connection  ${OPENBMC_HOST}
     @{ssh_status_list}=  Create List
-    FOR  ${iter}  IN RANGE  ${1}  ${loop_iterations} + 1
+    FOR  ${iter}  IN RANGE  ${1}  ${loop_iteration} + 1
       Log To Console  ${iter}th iteration
       ${invalid_password}=   Catenate  ${OPENBMC_PASSWORD}${iter}
       Run Keyword and Ignore Error