[PATCH] diff-lib: drop return value from do_diff_cache()

[Nguyễn Thái Ngọc Duy]

Since 204ce97 (Also use unpack_trees() in do_diff_cache() -
2008-01-20), do_diff_cache() always returns zero. It does not make
sense to check its return value any more.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 I don't know the history behind this function. But it feels not right
 to do exit(128) in do_diff_cache (since 203a2fe (Allow callers of
 unpack_trees() to handle failure - 2008-02-07) and limit the caller's
 control here.

 builtin/reset.c | 3 +--
 diff-lib.c      | 3 +--
 diff.h          | 2 +-
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/builtin/reset.c b/builtin/reset.c
index 6032131..843d337 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -140,8 +140,7 @@ static int read_from_tree(const char **pathspec, unsigned 
char *tree_sha1)
        opt.format_callback = update_index_from_diff;
 
        read_cache();
-       if (do_diff_cache(tree_sha1, &opt))
-               return 1;
+       do_diff_cache(tree_sha1, &opt);
        diffcore_std(&opt);
        diff_flush(&opt);
        diff_tree_release_paths(&opt);
diff --git a/diff-lib.c b/diff-lib.c
index f35de0f..5a5fc94 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -495,7 +495,7 @@ int run_diff_index(struct rev_info *revs, int cached)
        return 0;
 }
 
-int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
+void do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
 {
        struct rev_info revs;
 
@@ -505,7 +505,6 @@ int do_diff_cache(const unsigned char *tree_sha1, struct 
diff_options *opt)
 
        if (diff_cache(&revs, tree_sha1, NULL, 1))
                exit(128);
-       return 0;
 }
 
 int index_differs_from(const char *def, int diff_flags)
diff --git a/diff.h b/diff.h
index 78b4091..aaa9a4e 100644
--- a/diff.h
+++ b/diff.h
@@ -319,7 +319,7 @@ extern const char *diff_unique_abbrev(const unsigned char 
*, int);
 extern int run_diff_files(struct rev_info *revs, unsigned int option);
 extern int run_diff_index(struct rev_info *revs, int cached);
 
-extern int do_diff_cache(const unsigned char *, struct diff_options *);
+extern void do_diff_cache(const unsigned char *, struct diff_options *);
 extern int diff_flush_patch_id(struct diff_options *, unsigned char *);
 
 extern int diff_result_code(struct diff_options *, int);
-- 
1.8.1.2.536.gf441e6d

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