tests: PV cmdSetViewport code style updates

Was mucking around in here anyway, so fixed up a few var names.

Change-Id: I15f6eab8a94ed73ad3d2f0db143f099732ff54f7
diff --git a/layers/parameter_validation.cpp b/layers/parameter_validation.cpp
index cef131a..4064e6f 100644
--- a/layers/parameter_validation.cpp
+++ b/layers/parameter_validation.cpp
@@ -3975,13 +3975,13 @@
 
 VKAPI_ATTR void VKAPI_CALL CmdSetViewport(VkCommandBuffer commandBuffer, uint32_t firstViewport, uint32_t viewportCount,
                                           const VkViewport *pViewports) {
-    bool skip_call = false;
+    bool skip = false;
     layer_data *my_data = get_my_data_ptr(get_dispatch_key(commandBuffer), layer_data_map);
     assert(my_data != NULL);
 
-    skip_call |= preCmdSetViewport(my_data->report_data, viewportCount, pViewports);
+    skip |= preCmdSetViewport(my_data->report_data, viewportCount, pViewports);
 
-    if (!skip_call) {
+    if (!skip) {
         get_dispatch_table(pc_device_table_map, commandBuffer)
             ->CmdSetViewport(commandBuffer, firstViewport, viewportCount, pViewports);
     }