Return a proper value

redis_sock_read_multibulk_reply_zipped_with_flag should always return
a value.  We merged in a change that handled a certain error condition
that was using RETURN_FALSE (and therefore not returning a value)

Simply changed this to RETVAL_FALSE and return -1;
Merge branch 'hotfix/add_retval_zipped_wreply'
Fix each place we're erroring out but return a value as the
methods are int returns

Resolves issues pertaining to #303
Merge branch 'hotfix/fix_return_values'