Minor refactoring for fabric.p4

Change-Id: I736b20fc95b4a03afa1074eb777a23507530b44f
diff --git a/pipelines/fabric/src/main/resources/fabric.p4 b/pipelines/fabric/src/main/resources/fabric.p4
index e417e4b..d27ed87 100644
--- a/pipelines/fabric/src/main/resources/fabric.p4
+++ b/pipelines/fabric/src/main/resources/fabric.p4
@@ -48,11 +48,11 @@
 control FabricEgress (inout parsed_headers_t hdr,
                       inout fabric_metadata_t fabric_metadata,
                       inout standard_metadata_t standard_metadata) {
-    PacketIoEgress() pktIoEgress;
+    PacketIoEgress() pkt_io_egress;
     EgressNextControl() egress_next;
     apply {
         egress_next.apply(hdr, fabric_metadata, standard_metadata);
-        pktIoEgress.apply(hdr, fabric_metadata, standard_metadata);
+        pkt_io_egress.apply(hdr, fabric_metadata, standard_metadata);
     }
 }