Merge pull request libgit2#4774 from tiennou/fix/clang-analyzer

Coverity flavored clang analyzer fixes

Author: pks-t

src/mailmap.c

@@ -225,7 +225,7 @@ int git_mailmap_add_entry(
 
 static int mailmap_add_buffer(git_mailmap *mm, const char *buf, size_t len)
 {
-	int error;
+	int error = 0;
 	git_parse_ctx ctx;
 
 	/* Scratch buffers containing the real parsed names & emails */

src/remote.c

@@ -428,7 +428,7 @@ static int get_optional_config(
 
 int git_remote_lookup(git_remote **out, git_repository *repo, const char *name)
 {
-	git_remote *remote;
+	git_remote *remote = NULL;
 	git_buf buf = GIT_BUF_INIT;
 	const char *val;
 	int error = 0;
@@ -510,7 +510,7 @@ int git_remote_lookup(git_remote **out, git_repository *repo, const char *name)
 	if ((error = get_optional_config(NULL, config, &buf, refspec_cb, &data)) < 0)
 		goto cleanup;
 
-	if (download_tags_value(remote, config) < 0)
+	if ((error = download_tags_value(remote, config)) < 0)
 		goto cleanup;
 
 	if ((error = lookup_remote_prune_config(remote, config, name)) < 0)

src/revwalk.c

@@ -550,7 +550,7 @@ static int sort_in_topological_order(git_commit_list **out, git_revwalk *walk, g
 
 static int prepare_walk(git_revwalk *walk)
 {
-	int error;
+	int error = 0;
 	git_commit_list *list, *commits = NULL;
 	git_commit_list_node *next;
 

src/transports/http.c

@@ -142,7 +142,7 @@ static int auth_context_match(
 	}
 
 	if (!scheme)
-		return 0;
+		return -1;
 
 	/* See if authentication has already started for this scheme */
 	git_vector_foreach(&t->auth_contexts, i, c) {