[PATCH 1/3] setup: drop return value from `read_repository_format()`

["Martin Ågren" <martin.agren@gmail.com>]

No-one looks at the return value, so we might as well drop it. It's
still available as `format->version`.

In v1 of what became commit 2cc7c2c737 ("setup: refactor repo format
reading and verification", 2016-03-11), this function actually had
return type "void", but that was changed in v2. Almost three years
later, no-one has used this return value.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 I only discovered the full history after writing the patch. Had I known
 it from the beginning, maybe I'd have just skipped this step, but I was
 sufficiently disturbed by the redundant and unused return value that I
 dropped it before working on the actual meat of this series.

 cache.h | 7 +++----
 setup.c | 3 +--
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/cache.h b/cache.h
index ca36b44ee0..8b9e592c65 100644
--- a/cache.h
+++ b/cache.h
@@ -974,11 +974,10 @@ struct repository_format {
 
 /*
  * Read the repository format characteristics from the config file "path" into
- * "format" struct. Returns the numeric version. On error, -1 is returned,
- * format->version is set to -1, and all other fields in the struct are
- * undefined.
+ * "format" struct. On error, format->version is set to -1, and all other
+ * fields in the struct are undefined.
  */
-int read_repository_format(struct repository_format *format, const char *path);
+void read_repository_format(struct repository_format *format, const char *path);
 
 /*
  * Verify that the repository described by repository_format is something we
diff --git a/setup.c b/setup.c
index 1be5037f12..27747af7a3 100644
--- a/setup.c
+++ b/setup.c
@@ -509,7 +509,7 @@ static int check_repository_format_gently(const char *gitdir, struct repository_
 	return 0;
 }
 
-int read_repository_format(struct repository_format *format, const char *path)
+void read_repository_format(struct repository_format *format, const char *path)
 {
 	memset(format, 0, sizeof(*format));
 	format->version = -1;
@@ -517,7 +517,6 @@ int read_repository_format(struct repository_format *format, const char *path)
 	format->hash_algo = GIT_HASH_SHA1;
 	string_list_init(&format->unknown_extensions, 1);
 	git_config_from_file(check_repo_format, path, format);
-	return format->version;
 }
 
 int verify_repository_format(const struct repository_format *format,
-- 
2.20.1