Fix try/catch pattern match when decoding modfuns.
Fix try/catch pattern match when decoding modfuns.

jmayfield74/riak_pb,SyncFree/riak_pb,riak-synrc/riak_pb,groovenauts-erlang/riak_pb,inaka/riak_pb,drewkerrigan/riak_pb,lixen/riak_pb,groovenauts-erlang/riak_pb,inaka/riak_pb,groovenauts-erlang/riak_pb,SyncFree/riak_pb,inaka/riak_pb,lixen/riak_pb,lixen/riak_pb,marsleezm/riak_pb,riak-synrc/riak_pb,jmayfield74/riak_pb,jmayfield74/riak_pb,marsleezm/riak_pb,basho/riak_pb