dome_key_state_load_map_group(): Get rid of error chain on parse

Since 'combine' errors aren't included in our error chain, calling
`chain_err()` only printed the message inside, not the parser error.

The trouble is, we can't add 'combine''s error to 'error-chain' because
it needs a lifetime:

    combine::Easy::Errors<char, &str, SourcePosition>

and you can't use errors with lifetimes in 'error-chain'.

Since we can't use 'error-chain', just use the 'combine' error directly.
This doesn't allow us to chain an addiitional error message, but does
correctly print the parse error message.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/ffi.rs b/src/ffi.rs
index 4738c18..7a9db59 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -72,9 +72,7 @@ pub extern "C" fn dome_key_state_load_map_group(ptr: *mut State) {
                         },
                     };
 
-                    let map_group = match MapGroup::parse(&state.mappings_str)
-                        .chain_err(|| "failed to parse 'mappings.dkmap'")
-                    {
+                    let map_group = match MapGroup::parse(&state.mappings_str) {
                         Ok(mut map_group) => {
                             map_group.parse_actions();
                             Some(map_group)