[niepce/lr-import: 16/20] rust: Fix some compiler warnings

[Hubert Figuière <hub src gnome org>]

commit 0a932241929c737398b881525ef84cbf0e3c31fd
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Dec 12 18:37:34 2021 -0500

    rust: Fix some compiler warnings

 crates/npc-engine/src/bin/importlr.rs |  2 +-
 crates/npc-fwk/src/utils/exempi.rs    | 16 ++++++++++++----
 2 files changed, 13 insertions(+), 5 deletions(-)
---
diff --git a/crates/npc-engine/src/bin/importlr.rs b/crates/npc-engine/src/bin/importlr.rs
index ba5aa77..a8bd352 100644
--- a/crates/npc-engine/src/bin/importlr.rs
+++ b/crates/npc-engine/src/bin/importlr.rs
@@ -36,7 +36,7 @@ fn main() {
     let catalog = matches.value_of("CATALOG").unwrap();
     let verbosity = matches.occurrences_of("v");
 
-    let (sender, recv) = async_channel::unbounded();
+    let (sender, _recv) = async_channel::unbounded();
 
     let mut library = LibraryClient::new(PathBuf::from(library), sender);
     // library.init();
diff --git a/crates/npc-fwk/src/utils/exempi.rs b/crates/npc-fwk/src/utils/exempi.rs
index 1a555f3..3ac5e91 100644
--- a/crates/npc-fwk/src/utils/exempi.rs
+++ b/crates/npc-fwk/src/utils/exempi.rs
@@ -133,13 +133,21 @@ pub struct ExempiManager {}
 
 impl ExempiManager {
     pub fn new(namespaces: Option<Vec<NsDef>>) -> ExempiManager {
-        exempi2::register_namespace(NIEPCE_XMP_NAMESPACE, NIEPCE_XMP_NS_PREFIX);
-        exempi2::register_namespace(UFRAW_INTEROP_NAMESPACE, UFRAW_INTEROP_NS_PREFIX);
+        on_err_out!(exempi2::register_namespace(
+            NIEPCE_XMP_NAMESPACE,
+            NIEPCE_XMP_NS_PREFIX
+        ));
+        on_err_out!(exempi2::register_namespace(
+            UFRAW_INTEROP_NAMESPACE,
+            UFRAW_INTEROP_NS_PREFIX
+        ));
 
         if let Some(nslist) = namespaces {
             for nsdef in nslist {
-                // TOOD check the return value
-                exempi2::register_namespace(nsdef.ns.as_str(), nsdef.prefix.as_str());
+                on_err_out!(exempi2::register_namespace(
+                    nsdef.ns.as_str(),
+                    nsdef.prefix.as_str()
+                ));
             }
         }
         ExempiManager {}