Fix missing break statement found by Sonar

Change-Id: I5581aca308531517b1e73751487c042ab09ec606
diff --git a/web/api/src/main/java/org/onosproject/codec/impl/InstructionCodec.java b/web/api/src/main/java/org/onosproject/codec/impl/InstructionCodec.java
index 81bd432..29d1ad7 100644
--- a/web/api/src/main/java/org/onosproject/codec/impl/InstructionCodec.java
+++ b/web/api/src/main/java/org/onosproject/codec/impl/InstructionCodec.java
@@ -169,6 +169,7 @@
                 final L3ModificationInstruction l3ModificationInstruction =
                         (L3ModificationInstruction) instruction;
                 encodeL3(result, l3ModificationInstruction);
+                break;
 
             default:
                 log.info("Cannot convert instruction type of {}", instruction.type());