[PATCH] cli: mime node: fix compiler warning when building against gmime 2.4

[Jani Nikula]

commit d487ef9e58bcd193118f19f771d5ef3984616be5
Author: Jani Nikula <jani at nikula.org>
Date:   Sat Mar 30 15:53:16 2013 +0200

    cli: mime node: abstract decryption and signature verification

introduced a compiler warning, reported by Mark Walters, when building
against gmime 2.4:

mime-node.c:224:9: warning: assignment discards ‘const’ qualifier from
pointer target type [enabled by default]

Pass the non-const signature validity to the destructor to fix this.

---

Not even compile tested as I don't have gmime 2.4 on any
systems... Mark, please build and run the tests with this. Thanks.
---
 mime-node.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/mime-node.c b/mime-node.c
index 851f963..fd9e4a4 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -217,11 +217,12 @@ _signature_validity_free (GMimeSignatureValidity **proxy)
 
 /* Set up signature validity destructor (GMime 2.4) */
 static void
-set_signature_validity_destructor (mime_node_t *node)
+set_signature_validity_destructor (mime_node_t *node,
+				   GMimeSignatureValidity *sig_validity)
 {
     GMimeSignatureValidity **proxy = talloc (node, GMimeSignatureValidity *);
     if (proxy) {
-	*proxy = node->sig_validity;
+	*proxy = sig_validity;
 	talloc_set_destructor (proxy, _signature_validity_free);
     }
 }
@@ -232,12 +233,14 @@ node_verify (mime_node_t *node, GMimeObject *part,
 	     notmuch_crypto_context_t *cryptoctx)
 {
     GError *err = NULL;
+    GMimeSignatureValidity *sig_validity;
 
     node->verify_attempted = TRUE;
-    node->sig_validity = g_mime_multipart_signed_verify
+    sig_validity = g_mime_multipart_signed_verify
 	(GMIME_MULTIPART_SIGNED (part), cryptoctx, &err);
-    if (node->sig_validity) {
-	set_signature_validity_destructor (node);
+    node->sig_validity = sig_validity;
+    if (sig_validity) {
+	set_signature_validity_destructor (node, sig_validity);
     } else {
 	fprintf (stderr, "Failed to verify signed part: %s\n",
 		 err ? err->message : "no error explanation given");
-- 
1.7.10.4