[gmime] Clear gpgme signers in error conditions

[Jeffrey Stedfast <fejj src gnome org>]

commit 7481e0a9c392e19795a6eb0c24559e5d81860342
Author: Jeffrey Stedfast <fejj gnome org>
Date:   Wed Mar 8 09:25:15 2017 -0500

    Clear gpgme signers in error conditions

 gmime/gmime-pkcs7-context.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gmime/gmime-pkcs7-context.c b/gmime/gmime-pkcs7-context.c
index 399fe46..d84bbf2 100644
--- a/gmime/gmime-pkcs7-context.c
+++ b/gmime/gmime-pkcs7-context.c
@@ -409,11 +409,13 @@ pkcs7_sign (GMimeCryptoContext *context, gboolean detach, const char *userid, GM
        
        if ((error = gpgme_data_new_from_cbs (&input, &pkcs7_stream_funcs, istream)) != GPG_ERR_NO_ERROR) {
                g_set_error (err, GMIME_GPGME_ERROR, error, _("Could not open input stream: %s"), 
gpgme_strerror (error));
+               gpgme_signers_clear (pkcs7->ctx);
                return -1;
        }
        
        if ((error = gpgme_data_new_from_cbs (&output, &pkcs7_stream_funcs, ostream)) != GPG_ERR_NO_ERROR) {
                g_set_error (err, GMIME_GPGME_ERROR, error, _("Could not open output stream: %s"), 
gpgme_strerror (error));
+               gpgme_signers_clear (pkcs7->ctx);
                gpgme_data_release (input);
                return -1;
        }
@@ -421,11 +423,13 @@ pkcs7_sign (GMimeCryptoContext *context, gboolean detach, const char *userid, GM
        /* sign the input stream */
        if ((error = gpgme_op_sign (pkcs7->ctx, input, output, mode)) != GPG_ERR_NO_ERROR) {
                g_set_error (err, GMIME_GPGME_ERROR, error, _("Signing failed: %s"), gpgme_strerror (error));
+               gpgme_signers_clear (pkcs7->ctx);
                gpgme_data_release (output);
                gpgme_data_release (input);
                return -1;
        }
        
+       gpgme_signers_clear (pkcs7->ctx);
        gpgme_data_release (output);
        gpgme_data_release (input);