The struct has been growing members whose malloced memory needs to be
freed. Do this with one helper function so that no malloced memory shall
be left unfreed.

Signed-off-by: Michael J Gruber <g...@drmicha.warpmail.net>
---
 builtin/merge.c |  5 +----
 gpg-interface.c | 12 ++++++++++++
 gpg-interface.h |  1 +
 pretty.c        |  3 +--
 4 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index b49c310..86e9c61 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1282,10 +1282,7 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
                                printf(_("Commit %s has a good GPG signature by 
%s\n"),
                                       hex, signature_check.signer);
 
-                       free(signature_check.gpg_output);
-                       free(signature_check.gpg_status);
-                       free(signature_check.signer);
-                       free(signature_check.key);
+                       signature_check_clear(&signature_check);
                }
        }
 
diff --git a/gpg-interface.c b/gpg-interface.c
index 8b0e874..e71b59d 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -7,6 +7,18 @@
 static char *configured_signing_key;
 static const char *gpg_program = "gpg";
 
+void signature_check_clear(struct signature_check *sigc)
+{
+       free(sigc->gpg_output);
+       free(sigc->gpg_status);
+       free(sigc->signer);
+       free(sigc->key);
+       sigc->gpg_output = NULL;
+       sigc->gpg_status = NULL;
+       sigc->signer = NULL;
+       sigc->key = NULL;
+}
+
 void set_signing_key(const char *key)
 {
        free(configured_signing_key);
diff --git a/gpg-interface.h b/gpg-interface.h
index a85cb5b..9f0784a 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -13,6 +13,7 @@ struct signature_check {
        char *key;
 };
 
+extern void signature_check_clear(struct signature_check *sigc);
 extern int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const 
char *signing_key);
 extern int verify_signed_buffer(const char *payload, size_t payload_size, 
const char *signature, size_t signature_size, struct strbuf *gpg_output, struct 
strbuf *gpg_status);
 extern int git_gpg_config(const char *, const char *, void *);
diff --git a/pretty.c b/pretty.c
index ce3bbaa..353af81 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1520,8 +1520,7 @@ void format_commit_message(const struct commit *commit,
 
        free(context.commit_encoding);
        unuse_commit_buffer(commit, context.message);
-       free(context.signature_check.gpg_output);
-       free(context.signature_check.signer);
+       signature_check_clear(&context.signature_check);
 }
 
 static void pp_header(struct pretty_print_context *pp,
-- 
2.0.1.563.g162087b.dirty

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