[balsa] Ensure utf8-clean crypto key uid

[Albrecht Dreß <albrecht src gnome org>]

commit 55af8c065c9be814e77d5276712b3d1ab5b1d1b2
Author: Albrecht Dreß <albrecht dress arcor de>
Date:   Thu Jul 9 18:44:37 2020 +0200

    Ensure utf8-clean crypto key uid
    
    - libbalsa/gmime-gpgme-signature.c, tokenize_subject(): ensure all
    returned components of GnuPG key uid or x509 subject string are
    utf8-clean
    
    Signed-off-by: Albrecht Dreß <albrecht dress arcor de>

 libbalsa/gmime-gpgme-signature.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/libbalsa/gmime-gpgme-signature.c b/libbalsa/gmime-gpgme-signature.c
index cc44ada12..8945ababa 100644
--- a/libbalsa/gmime-gpgme-signature.c
+++ b/libbalsa/gmime-gpgme-signature.c
@@ -406,6 +406,10 @@ tokenize_subject(const gchar *subject,
                                }
                                libbalsa_utf8_sanitize(&result[n + 1], TRUE, NULL);
                        }
+
+                       if ((result[n] != NULL) && (result[n + 1] == NULL)) {
+                               libbalsa_utf8_sanitize(&result[n], TRUE, NULL);
+                       }
                }
        }