[niepce] exiv2: (style) use uppercase for the lazy static

[Hubert Figuière <hub src gnome org>]

commit 14fd39e808d6f8b99570ef1fee1e7aa9a4b00bc5
Author: Hubert Figuière <hub figuiere net>
Date:   Sat Apr 13 16:14:41 2019 -0400

    exiv2: (style) use uppercase for the lazy static

 src/fwk/utils/exiv2.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/fwk/utils/exiv2.rs b/src/fwk/utils/exiv2.rs
index 897dd27..898c850 100644
--- a/src/fwk/utils/exiv2.rs
+++ b/src/fwk/utils/exiv2.rs
@@ -52,7 +52,7 @@ enum Converted {
 }
 
 lazy_static! {
-    static ref exiv2_to_xmp: MultiMap<&'static str, (&'static str, &'static str, Conversion)> = {
+    static ref EXIV2_TO_XMP: MultiMap<&'static str, (&'static str, &'static str, Conversion)> = {
         [
             ("Exif.Image.DateTime", (NS_XAP, "ModifyDate", Conversion::ExifDate)),
             ("Exif.Image.ImageHeight", (NS_TIFF, "ImageHeight", Conversion::None)),
@@ -147,7 +147,7 @@ pub fn xmp_from_exiv2<S: AsRef<OsStr>>(file: S) -> Option<XmpMeta> {
             all_tags.append(&mut tags);
         }
         for tag in all_tags {
-            if let Some(xmp_props) = exiv2_to_xmp.get_vec(tag.as_str()) {
+            if let Some(xmp_props) = EXIV2_TO_XMP.get_vec(tag.as_str()) {
                 for xmp_prop in xmp_props {
                     let tagtype = rexiv2::get_tag_type(&tag);
                     match tagtype {