[PATCH 1/4] C: s/0/NULL/ for pointer type

["Đoàn Trần Công Danh" <congdanhqx@gmail.com>]

Fix warning from  `make sparse`.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 add-interactive.c                   | 2 +-
 builtin/fmt-merge-msg.c             | 2 +-
 log-tree.c                          | 4 ++--
 range-diff.c                        | 2 +-
 t/helper/test-parse-pathspec-file.c | 6 +++---
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/add-interactive.c b/add-interactive.c
index 29cd2fe020..b8983838b9 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -526,7 +526,7 @@ static int get_modified_files(struct repository *r,
 
 	for (i = 0; i < 2; i++) {
 		struct rev_info rev;
-		struct setup_revision_opt opt = { 0 };
+		struct setup_revision_opt opt = { NULL };
 
 		if (filter == INDEX_ONLY)
 			s.mode = (i == 0) ? FROM_INDEX : FROM_WORKTREE;
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 172dfbd852..f4376bccef 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -494,7 +494,7 @@ static void fmt_merge_msg_sigs(struct strbuf *out)
 		enum object_type type;
 		unsigned long size, len;
 		char *buf = read_object_file(oid, &type, &size);
-		struct signature_check sigc = { 0 };
+		struct signature_check sigc = { NULL };
 		struct strbuf sig = STRBUF_INIT;
 
 		if (!buf || type != OBJ_TAG)
diff --git a/log-tree.c b/log-tree.c
index 0064788b25..ca721150d4 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -449,7 +449,7 @@ static void show_signature(struct rev_info *opt, struct commit *commit)
 {
 	struct strbuf payload = STRBUF_INIT;
 	struct strbuf signature = STRBUF_INIT;
-	struct signature_check sigc = { 0 };
+	struct signature_check sigc = { NULL };
 	int status;
 
 	if (parse_signed_commit(commit, &payload, &signature) <= 0)
@@ -496,7 +496,7 @@ static int show_one_mergetag(struct commit *commit,
 	struct object_id oid;
 	struct tag *tag;
 	struct strbuf verify_message;
-	struct signature_check sigc = { 0 };
+	struct signature_check sigc = { NULL };
 	int status, nth;
 	size_t payload_size;
 
diff --git a/range-diff.c b/range-diff.c
index f745567cf6..71dcd947c5 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -107,7 +107,7 @@ static int read_patches(const char *range, struct string_list *list,
 		}
 
 		if (starts_with(line, "diff --git")) {
-			struct patch patch = { 0 };
+			struct patch patch = { NULL };
 			struct strbuf root = STRBUF_INIT;
 			int linenr = 0;
 
diff --git a/t/helper/test-parse-pathspec-file.c b/t/helper/test-parse-pathspec-file.c
index 02f4ccfd2a..b3e08cef4b 100644
--- a/t/helper/test-parse-pathspec-file.c
+++ b/t/helper/test-parse-pathspec-file.c
@@ -6,7 +6,7 @@
 int cmd__parse_pathspec_file(int argc, const char **argv)
 {
 	struct pathspec pathspec;
-	const char *pathspec_from_file = 0;
+	const char *pathspec_from_file = NULL;
 	int pathspec_file_nul = 0, i;
 
 	static const char *const usage[] = {
@@ -20,9 +20,9 @@ int cmd__parse_pathspec_file(int argc, const char **argv)
 		OPT_END()
 	};
 
-	parse_options(argc, argv, 0, options, usage, 0);
+	parse_options(argc, argv, NULL, options, usage, 0);
 
-	parse_pathspec_file(&pathspec, 0, 0, 0, pathspec_from_file,
+	parse_pathspec_file(&pathspec, 0, 0, NULL, pathspec_from_file,
 			    pathspec_file_nul);
 
 	for (i = 0; i < pathspec.nr; i++)
-- 
2.26.2.384.g435bf60bd5