[niepce] C++: fix a few new warnings with clang.

[Hubert Figuière <hub src gnome org>]

commit 38306cecc5c38df79ffe2c45b5db2a852dbae39a
Author: Hubert Figuière <hub figuiere net>
Date:   Thu Feb 22 01:37:38 2018 -0500

    C++: fix a few new warnings with clang.

 src/engine/db/libmetadata.cpp      | 6 +++---
 src/fwk/toolkit/metadatawidget.cpp | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/engine/db/libmetadata.cpp b/src/engine/db/libmetadata.cpp
index 1abed0f..7ade2ca 100644
--- a/src/engine/db/libmetadata.cpp
+++ b/src/engine/db/libmetadata.cpp
@@ -60,13 +60,13 @@ IndexToXmp property_index_to_xmp(fwk::PropertyIndex index)
     PropsToXmpMap::const_iterator iter = propmap.find(index);
     if (iter == propmap.end()) {
         // not found
-        return {ns: nullptr, property: nullptr};
+        return {nullptr, nullptr};
     }
     if (iter->second.first == NULL || iter->second.second == NULL) {
         // no XMP equivalent
-        return {ns: nullptr, property: nullptr};
+        return {nullptr, nullptr};
     }
-    return {ns: iter->second.first, property: iter->second.second};
+    return {iter->second.first, iter->second.second};
 }
 
 fwk::PropertyBagPtr libmetadata_to_properties(const LibMetadata* meta,
diff --git a/src/fwk/toolkit/metadatawidget.cpp b/src/fwk/toolkit/metadatawidget.cpp
index ce38485..39f846e 100644
--- a/src/fwk/toolkit/metadatawidget.cpp
+++ b/src/fwk/toolkit/metadatawidget.cpp
@@ -441,7 +441,7 @@ void MetaDataWidget::add_data(const MetaDataFormat * current,
         break;
     default:
         if (!set_string_data(w, current->readonly, value)) {
-            ERR_OUT("failed to set value for %ld", current->id);
+            ERR_OUT("failed to set value for %u", current->id);
         }
         break;
     }