Fetch libexif 0.6.21 to include the security fixes.

libexif/sources/libexif/canon/mnote-canon-tag.c

Index: libexif/sources/libexif/canon/mnote-canon-tag.c
===================================================================
--- libexif/sources/libexif/canon/mnote-canon-tag.c	(revision 143189)
+++ libexif/sources/libexif/canon/mnote-canon-tag.c	(working copy)
@@ -161,7 +161,7 @@
 	unsigned int i;
 
 #if defined(BIND_TEXTDOMAIN)
-	bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+        bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
 #endif
 	for (i = 0; i < sizeof (table) / sizeof (table[0]); i++)
 		if (table[i].tag == t) return (_(table[i].title));
@@ -194,10 +194,10 @@
 
 	for (i = 0; i < sizeof (table) / sizeof (table[0]); i++)
 		if (table[i].tag == t) {
-			if (!*table[i].description)
+			if (!table[i].description || !*table[i].description)
 				return "";
 #if defined(BIND_TEXTDOMAIN)
-                	bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+			bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
 #endif
 			return _(table[i].description);
 		}