return statement is not needed

we have updated yaml file to return error code in case of
invalid ip/gateway/prefix, no need of return statement now.

Change-Id: I9a32e3df12f8f521f5353b011c6a51698bd77403
Signed-off-by: Nagaraju Goruganti <ngorugan@in.ibm.com>
diff --git a/ethernet_interface.cpp b/ethernet_interface.cpp
index 9e7fd57..f58c752 100644
--- a/ethernet_interface.cpp
+++ b/ethernet_interface.cpp
@@ -150,7 +150,6 @@
         elog<InvalidArgument>(Argument::ARGUMENT_NAME("prefixLength"),
                               Argument::ARGUMENT_VALUE(std::to_string(
                                           prefixLength).c_str()));
-        return;
     }