add unwrap_or_err to result

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/result.rs

@@ -7,10 +7,12 @@ mod log_err;
 mod map_expect;
 mod not_found;
 mod unwrap_infallible;
+mod unwrap_or_err;
 
 pub use self::{
 	debug_inspect::DebugInspect, filter::Filter, flat_ok::FlatOk, into_is_ok::IntoIsOk, log_debug_err::LogDebugErr,
 	log_err::LogErr, map_expect::MapExpect, not_found::NotFound, unwrap_infallible::UnwrapInfallible,
+	unwrap_or_err::UnwrapOrErr,
 };
 
 pub type Result<T = (), E = crate::Error> = std::result::Result<T, E>;